lib: rand: introduce new configs: CONFIG_LIB_RAND and CONFIG_LIB_HW_RAND

New configs:
- CONFIG_LIB_RAND    - to enable implementation of rand library in lib/rand.c
- CONFIG_LIB_HW_RAND - to enable hardware based implementations of lib rand

Other changes:
- add CONFIG_LIB_RAND to boards configs which needs rand()
- put only one rand.o dependency in lib/Makefile

CONFIG_LIB_HW_RAND should be defined for drivers which implements rand library
(declared in include/common.h):
- void srand(unsigned int seed)
- unsigned int rand(void)
- unsigned int rand_r(unsigned int *seedp)

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Michael Walle <michael@walle.cc>
Cc: Tom Rini <trini@ti.com>
Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>

include/common.h

@@ -835,9 +835,7 @@ char *	strmhz(char *buf, unsigned long hz);
 #include <u-boot/crc.h>
 
 /* lib/rand.c */
-#if defined(CONFIG_RANDOM_MACADDR) || \
-	defined(CONFIG_BOOTP_RANDOM_DELAY) || \
-	defined(CONFIG_CMD_LINK_LOCAL)
+#if defined(CONFIG_LIB_RAND) || defined(CONFIG_LIB_HW_RAND)
 #define RAND_MAX -1U
 void srand(unsigned int seed);
 unsigned int rand(void);

include/configs/MERGERBOX.h

@@ -312,6 +312,7 @@
 #define CONFIG_BOOTP_NTPSERVER
 #define CONFIG_BOOTP_RANDOM_DELAY
 #define CONFIG_BOOTP_SEND_HOSTNAME
+#define CONFIG_LIB_RAND
 
 /*
  * Command line configuration.

include/configs/MVBC_P.h

@@ -104,6 +104,7 @@
 #define CONFIG_BOOTP_NTPSERVER
 #define CONFIG_BOOTP_RANDOM_DELAY
 #define CONFIG_BOOTP_SEND_HOSTNAME
+#define CONFIG_LIB_RAND
 
 /*
  * Autoboot

include/configs/MVBLM7.h

@@ -227,6 +227,7 @@
 #define CONFIG_BOOTP_NTPSERVER
 #define CONFIG_BOOTP_RANDOM_DELAY
 #define CONFIG_BOOTP_SEND_HOSTNAME
+#define CONFIG_LIB_RAND
 
 /* USB */
 #define CONFIG_SYS_USB_HOST

include/configs/MVSMR.h

@@ -92,6 +92,7 @@
 #define CONFIG_BOOTP_SEND_HOSTNAME
 #define CONFIG_BOOTP_SUBNETMASK
 #define CONFIG_BOOTP_VENDOREX
+#define CONFIG_LIB_RAND
 
 /*
  * Autoboot

include/configs/a3m071.h

@@ -58,6 +58,7 @@
 #define CONFIG_BOOTP_SERVERIP
 #define CONFIG_NET_RETRY_COUNT 3
 #define CONFIG_CMD_LINK_LOCAL
+#define CONFIG_LIB_RAND
 #define CONFIG_NETCONSOLE
 #define CONFIG_SYS_CONSOLE_IS_IN_ENV
 #define CONFIG_CMD_PING

include/configs/bfin_adi_common.h

@@ -17,6 +17,7 @@
 #  define CONFIG_BOOTP_DNS
 #  define CONFIG_BOOTP_NTPSERVER
 #  define CONFIG_BOOTP_RANDOM_DELAY
+#  define CONFIG_LIB_RAND
 #  define CONFIG_KEEP_SERVERADDR
 #  define CONFIG_CMD_DNS
 #  define CONFIG_CMD_PING

include/configs/lsxl.h

@@ -37,6 +37,7 @@
 #define CONFIG_SHOW_BOOT_PROGRESS
 
 #define CONFIG_RANDOM_MACADDR
+#define CONFIG_LIB_RAND
 #define CONFIG_KIRKWOOD_GPIO
 #define CONFIG_OF_LIBFDT
 

include/configs/sacsng.h

@@ -457,6 +457,7 @@
 #endif /* CONFIG_BOOT_ROOT_NFS */
 
 #define CONFIG_BOOTP_RANDOM_DELAY       /* Randomize the BOOTP retry delay */
+#define CONFIG_LIB_RAND
 
 /*
  * BOOTP options

lib/Makefile

@@ -62,8 +62,6 @@ obj-y += time.o
 obj-$(CONFIG_TRACE) += trace.o
 obj-$(CONFIG_BOOTP_PXE) += uuid.o
 obj-y += vsprintf.o
-obj-$(CONFIG_RANDOM_MACADDR) += rand.o
-obj-$(CONFIG_BOOTP_RANDOM_DELAY) += rand.o
-obj-$(CONFIG_CMD_LINK_LOCAL) += rand.o
+obj-$(CONFIG_LIB_RAND) += rand.o
 
 subdir-ccflags-$(CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED) += -O2