imx6: move all standard includes to mx6_common.h

The linux/sizes.h, asm/arch/imx-regs.h, asm/imx-common/gpio.h,
config_cmd_default.h includes are used fairly universally across imx6 boards
so include them in mx6_common.h by default.

We define CONFIG_SYS_NO_FLASH before config_cmd_default.h  so that we
don't have to undef CONFIG_CMD_FLASH / CONFIG_CMD_IMLS everywhere.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
diff --git a/include/configs/ot1200.h b/include/configs/ot1200.h
index 200f40a..15c49d9 100644
--- a/include/configs/ot1200.h
+++ b/include/configs/ot1200.h
@@ -13,9 +13,6 @@
 #define CONFIG_DISPLAY_CPUINFO
 #define CONFIG_DISPLAY_BOARDINFO
 
-#include <asm/arch/imx-regs.h>
-#include <asm/imx-common/gpio.h>
-
 #define CONFIG_CMDLINE_TAG
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_INITRD_TAG
@@ -152,9 +149,6 @@
 #define CONFIG_BAUDRATE                115200
 
 /* Command definition */
-#include <config_cmd_default.h>
-
-#undef CONFIG_CMD_IMLS
 
 #define CONFIG_BOOTDELAY               2
 
@@ -190,9 +184,7 @@
 #define CONFIG_SYS_INIT_SP_ADDR \
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
 
-/* FLASH and environment organization */
-#define CONFIG_SYS_NO_FLASH
-
+/* Environment organization */
 #define CONFIG_ENV_IS_IN_SPI_FLASH
 #define CONFIG_ENV_SIZE                 (64 * 1024)	/* 64 kb */
 #define CONFIG_ENV_OFFSET               (1024 * 1024)