uml: make use of 'rootfs-part' feature

Use 'rootfs-part' feature instead of referencing the TARGET_uml 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_uml
+		depends on USES_ROOTFS_PART || TARGET_ROOTFS_EXT4FS
 		default 104
 		help
 		  Select the root filesystem partition size.

target/linux/uml/Makefile

@@ -11,7 +11,7 @@ ifeq ($(HOST_OS),Linux)
 ARCH:=x86_64
 BOARD:=uml
 BOARDNAME:=User Mode Linux
-FEATURES:=squashfs ext4 audio
+FEATURES:=audio ext4 rootfs-part squashfs
 
 KERNEL_PATCHVER:=5.10