linux: enable features recommended by RAUC

RAUC recommends using the "verity" format for update bundles.
Those put additional requirements on available kernel features.

Use configuration recommended by RAUC documentation setting:
CONFIG_{MD,BLK_DEV_{DM,LOOP},DM_VERITY,SQUASHFS}=y.

Closes: https://git.ostc-eu.org/distro/oniro/-/issues/157


Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>