configs: kalama: use secondary mi2s backend for hdmi out for rb5gen2DVT

update the backend to MI2S-LPAIF-RX-SECONDARY for PAL_DEVICE_OUT_HDMI
as lt9611 is configured using secondary i2s interface.

Change-Id: I36b2f75b511e3e1410bedacc1bbca22c11249bc3
1 file changed