env: ti: boot: Extract command for eMMC Linux boot

Extract commands for booting Linux from eMMC to separate command. It
seems more logical that way, and allows us to run the whole command set
from U-Boot shell with only one command.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/environment/ti/boot.h

@@ -29,6 +29,11 @@
 	"partitions=" PARTS_DEFAULT "\0" \
 	"optargs=\0" \
 	"dofastboot=0\0" \
+	"emmc_linux_boot=" \
+		"setenv mmcdev 1; " \
+		"setenv bootpart 1:2; " \
+		"setenv mmcroot /dev/mmcblk0p2 rw; " \
+		"run mmcboot;\0" \
 	"emmc_android_boot=" \
 		"setenv eval_bootargs setenv bootargs $bootargs; " \
 		"run eval_bootargs; " \
@@ -93,10 +98,7 @@
 	"run findfdt; " \
 	"run envboot; " \
 	"run mmcboot;" \
-	"setenv mmcdev 1; " \
-	"setenv bootpart 1:2; " \
-	"setenv mmcroot /dev/mmcblk0p2 rw; " \
-	"run mmcboot;" \
+	"run emmc_linux_boot; " \
 	"run emmc_android_boot; " \
 	""