[OE-core] [PATCH] image_types: Add missing ext4 support

[Richard Purdie]

This is particularly problematic since qemu images switched to ext4 by 
default and now cannot work properly with UIs like hob.

This patch adds in ext4 to the appropriate IMAGE* variables fixing this.

[YOCTO #7426]

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 98a08bf..72c7337 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -146,6 +146,7 @@ IMAGE_TYPES = " \
     cramfs \
     ext2 ext2.gz ext2.bz2 ext2.lzma \
     ext3 ext3.gz \
+    ext4 ext4.gz \
     btrfs \
     iso \
     hddimg \
@@ -171,7 +172,7 @@ COMPRESS_DEPENDS_xz = "xz-native"
 COMPRESS_DEPENDS_lz4 = "lz4-native"
 COMPRESS_DEPENDS_sum = "mtd-utils-native"
 
-RUNNABLE_IMAGE_TYPES ?= "ext2 ext3"
+RUNNABLE_IMAGE_TYPES ?= "ext2 ext3 ext4"
 RUNNABLE_MACHINE_PATTERNS ?= "qemu"
 
 DEPLOYABLE_IMAGE_TYPES ?= "hddimg iso"