msm: clock-9625: Remove parent field of apcspll

A recent change to move the parent field into the top level struct clk
mistakenly added the parent for the active only apcspll which prevents
the CXO shutdown. Remove the parent of apcspll to fix this issue.

Change-Id: I81a508010512f7ae4ebc671268fdb4ca303feec8
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>