nios2: use cfi flash driver model

Use cfi flash driver model.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

configs/nios2-generic_defconfig

@@ -17,6 +17,8 @@ CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_ALTERA_PIO=y
 CONFIG_MISC=y
 CONFIG_ALTERA_SYSID=y
+CONFIG_MTD=y
+CONFIG_CFI_FLASH=y
 CONFIG_DM_ETH=y
 CONFIG_ALTERA_TSE=y
 CONFIG_ALTERA_JTAG_UART=y

include/configs/nios2-generic.h

@@ -24,13 +24,12 @@
 /*
  * CFI Flash
  */
-#define CONFIG_SYS_FLASH_BASE		0xe0000000
 #define CONFIG_FLASH_CFI_DRIVER
 #define CONFIG_SYS_CFI_FLASH_STATUS_POLL /* fix amd flash issue */
 #define CONFIG_SYS_FLASH_CFI
 #define CONFIG_SYS_FLASH_USE_BUFFER_WRITE
 #define CONFIG_SYS_FLASH_PROTECTION
-#define CONFIG_SYS_MAX_FLASH_BANKS	1
+#define CONFIG_SYS_MAX_FLASH_BANKS_DETECT	1
 #define CONFIG_SYS_MAX_FLASH_SECT	512
 
 /*