msm: clock: Support recursive handoffs

It is necessary to ensure that a clock's parents are handed off
before the clock itself. Otherwise, the clk_prepare_enable()
call on the child may fail if the parent's rate has not yet
been set.

CRs-Fixed: 362534
Change-Id: I7687708f3c85aab64bfc6284d2cf1ca0ad5cc520
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>