x86: Remove acpi=off boot parameter when ACPI is on

Remove the kernel boot parameter acpi=off so that kernel can turn on
ACPI support.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

include/configs/x86-common.h

@@ -193,14 +193,19 @@
 #define CONFIG_HOSTNAME		x86
 #define CONFIG_BOOTFILE		"bzImage"
 #define CONFIG_LOADADDR		0x1000000
-#define CONFIG_RAMDISK_ADDR		0x4000000
+#define CONFIG_RAMDISK_ADDR	0x4000000
+#ifdef CONFIG_GENERATE_ACPI_TABLE
+#define CONFIG_OTHBOOTARGS	"othbootargs=\0"
+#else
+#define CONFIG_OTHBOOTARGS	"othbootargs=acpi=off\0"
+#endif
 
 #define CONFIG_EXTRA_ENV_SETTINGS			\
 	CONFIG_STD_DEVICES_SETTINGS			\
 	"pciconfighost=1\0"				\
 	"netdev=eth0\0"					\
 	"consoledev=ttyS0\0"				\
-	"othbootargs=acpi=off\0"			\
+	CONFIG_OTHBOOTARGS				\
 	"ramdiskaddr=0x4000000\0"			\
 	"ramdiskfile=initramfs.gz\0"