ARM: mach-shmobile: SH7372 has 6 SCIFA and 1 SCIFB ports

The current SH7372 setup code registers 7 SCIF ports, which is wrong.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>