ARM: ti: consolidate mmc environment variables

Introduce include/environment/ti/mmc.h that
consolidates environment variable definitions
for various TI boards that support MMC/SD.

This allows reuse of same environment variables
on non-ARMv7 TI platforms like OMAP-L138 for
example.

While at it, move DFU-related environment variable
includes to only non-SPL builds for AM335x and
AM437x since they are not really used for SPL
today.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index ec99958..1feb946 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -13,7 +13,6 @@
 #define CONFIG_MAX_RAM_BANK_SIZE	(1024 << 21)	/* 2GB */
 #define CONFIG_SYS_TIMERBASE		0x48040000	/* Use Timer2 */
 
-#include <environment/ti/dfu.h>
 #include <asm/arch/omap.h>
 
 /* NS16550 Configuration */
@@ -162,6 +161,9 @@
 #define CONFIG_TI_EDMA3
 
 #ifndef CONFIG_SPL_BUILD
+#include <environment/ti/dfu.h>
+#include <environment/ti/mmc.h>
+
 #define CONFIG_EXTRA_ENV_SETTINGS \
 	DEFAULT_LINUX_BOOT_ENV \
 	DEFAULT_MMC_TI_ARGS \