ARM: mach-shmobile: sh73a0 PFC pull-up support for SDHI0+2

Extend the existing sh73a0 PFC code with pull-ups for
SDHI0 and SDHI2. Without this patch only SDHI1 has
pull-up support on sh73a0. Needed by boards that make
use of the internal pull-up resistor support built in
the SoC.

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