OMAP3 clock: recalculate DPLL subtree after bypass entry/exit

OMAP3 clock: recalculate DPLL subtree after bypass entry/exit

The DPLL's rate changes when it enters or leaves bypass, so the DPLL's
rate and the rates of all dependent clocks need to be recalculated
when this happens.

Also, fix test for bypass to test against the appropriate bypass clock,
rather than the parent clock (which is not the bypass clock for DPLL1
and DPLL2).

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>