ARM: shmobile: Configure r8a7791 PFC on Koelsch via DTS

Configure the "D" set of data signals for SCIF0 and SCIF1
on the Koelsch board to setup pinctrl serial console bits.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>