omap: make use of 'rootfs-part' feature

Use 'rootfs-part' feature instead of referencing the TARGET_omap in
Config-images.in.

Signed-off-by: Daniel Golle <[email protected]>

config/Config-images.in

@@ -296,7 +296,7 @@ menu "Target Images"
 
 	config TARGET_ROOTFS_PARTSIZE
 		int "Root filesystem partition size (in MiB)"
-		depends on USES_ROOTFS_PART || TARGET_ROOTFS_EXT4FS || TARGET_omap || TARGET_sunxi || TARGET_uml
+		depends on USES_ROOTFS_PART || TARGET_ROOTFS_EXT4FS || TARGET_sunxi || TARGET_uml
 		default 104
 		help
 		  Select the root filesystem partition size.

target/linux/omap/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=omap
 BOARDNAME:=TI OMAP3/4/AM33xx
-FEATURES:=usb usbgadget ext4 targz fpu audio display nand squashfs
+FEATURES:=usb usbgadget ext4 targz fpu audio display nand rootfs-part squashfs
 CPU_TYPE:=cortex-a8
 CPU_SUBTYPE:=vfpv3