sdk-root: add a check to avoid running kernel configuration code if kernel is not installed

platforms/sdk-root/post.inc.sh

@@ -82,6 +82,7 @@ esac
 echo $timezone > $MOUNTDIR/etc/timezone
 cp /usr/share/zoneinfo/$timezone $MOUNTDIR/etc/localtime
 
+if [ ! "$KERNEL_IGNORE" ]; then
    # update module dependencies
    chroot $MOUNTDIR depmod -a ${KERNEL_MAJVER}${KERNEL_EXTRAVER}
 
@@ -91,8 +92,9 @@ LANG=${LANGUAGE}_${COUNTRY} chroot $MOUNTDIR dracut \
       --nomdadmconf --nolvmconf \
       /boot/initramfs-${KERNEL_MAJVER}${KERNEL_EXTRAVER}.img.gz \
       ${KERNEL_MAJVER}${KERNEL_EXTRAVER}
+fi
 
 # don't remove static qemu for this platform
 QEMU_COPIED_FOR_INST=0
 
-prelink
+#prelink