ARM: shmobile: r8a7790: switch from scif to scifa

ARM: shmobile: r8a7790: switch from scif to scifa

SCIF and SCIFA can be plexed onto the same wires on Lager board. The
datasheet also describes the wires as SCIFA. So, to make use of the
bigger FIFOs switch to SCIFA instead.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 7c05589413fa9902f2843e91845d6084f6f8e2cd)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Conflicts:
	arch/arm/boot/dts/r8a7790-lager.dts