Add Hyundai A7

Signed-off-by: Luc Verhaegen <libv@skynet.be>
a20: fix permissions of merrii_hb.fex

Signed-off-by: Luc Verhaegen <libv@skynet.be>
a20: add hbd mid s906

Signed-off-by: Luc Verhaegen <libv@skynet.be>