ARM: mach-shmobile: sh73a0: fix div4 table

sh73a0 has divisor[12] setting as 1/7 on FRQCRA.

Signed-off-by: Takashi YOSHII <takashi.yoshii.zj@renesas.com>
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>