OMAP1 clock: convert armwdt_ck to use the fixed divisor recalc function

The armwdt_ck clock uses a fixed divisor, so it can use the OMAP clock
fixed divisor recalculation code, rather than a custom function.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

diff --cc arch/arm/mach-omap1/clock.c
Simple merge

diff --cc arch/arm/mach-omap1/clock_data.c
Simple merge