msm: clock-9625: Remove temp workaround of enable pnoc_msmbus_a_clk

With pnoc client driver ready, the temp workaround to enable
pnoc_msmbus_a_clk to prevent sending 0khz to rpm in clock post init
can be removed.

Change-Id: I40349ff7c9e71f18540504f1594a488865d2cee0
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>