images: Remove the sanity check for including an ext3 filesystem

This sanity check is included in the used bbclass directly and to
support both Edison and master we will need to remove the custom
python code due a change in indention in the python code.

recipes-apps/images/sysmocom-bsc-e1-image-directdisk.bb

@@ -7,13 +7,6 @@ LICENSE = "MIT"
 inherit boot-directdisk
 
 
-do_bootdirectdisk_prepend () {
-	import bb
-	fstypes = bb.data.getVar('IMAGE_FSTYPES', d, True)
-	if 'ext3' not in fstypes:
-		bb.msg.fatal(bb.msg.domain.Build, "ext3 not in IMAGE_FSTYPES")
-}
-
 ROOTFS = "${DEPLOY_DIR_IMAGE}/sysmocom-bsc-e1-image-${MACHINE}.ext3"
 do_bootdirectdisk[depends] += "sysmocom-bsc-e1-image:do_rootfs"
 

recipes-apps/images/sysmocom-bsc-ip-image-directdisk.bb

@@ -7,13 +7,6 @@ LICENSE = "MIT"
 inherit boot-directdisk
 
 
-do_bootdirectdisk_prepend () {
-	import bb
-	fstypes = bb.data.getVar('IMAGE_FSTYPES', d, True)
-	if 'ext3' not in fstypes:
-		bb.msg.fatal(bb.msg.domain.Build, "ext3 not in IMAGE_FSTYPES")
-}
-
 ROOTFS = "${DEPLOY_DIR_IMAGE}/sysmocom-bsc-ip-image-${MACHINE}.ext3"
 do_bootdirectdisk[depends] += "sysmocom-bsc-ip-image:do_rootfs"