meta-lxatac-bsp: emmc-image: do not DEPEND on genext2fs-native

The `genimage` version in meta-ptx was updated to v18,
which no longer uses `genext2fs` by default.
Which is great because the project is not well maintained and the
recipe for it was even removed in meta-ptx master.

Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>

Author: hnez

meta-lxatac-bsp/recipes-core/images/emmc-image.bb

@@ -3,7 +3,7 @@ SUMMARY = "eMMC image for the LXATAC Data Partitions"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
 
-DEPENDS += "genext2fs-native e2fsprogs-native"
+DEPENDS += "e2fsprogs-native"
 
 SRC_URI += "file://genimage.config"