ARM: mach-shmobile: Fix up pinmux entries in Makefile

Compiling in multiple CPUs into the same kernel binary
requires a Makefile update. With this patch in place
it is possible to enable the pinmux code for both the
SH7372 and the SH7377.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>