board/common: disable metadata checksumming for aux partition

U-Boot (2024.07) does not yet support the 'metadata_csum' feature flag
to Ext4 file systems.  So let's disable it for now in mkaux.sh so we
can allow builds for, e.g., the R2S and VisionFive2 boards to modify
and save their U-Boot environment.

Needed on the NanoPi R2S to set ethaddr + eth1addr since it does not
have any VPD EEPROM mounted.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/mkaux.sh

@@ -11,6 +11,7 @@ image aux.ext4 {
 	ext4 {
 		label = "aux"
 		use-mke2fs = true
+		features = "^metadata_csum,^metadata_csum_seed"
 	}
 }