Revert "clk: qcom: scc: Remove support of SCC PLLs for 8150"

In SA8155, SCC Q6 is not yet enabled. So configure the PLL
in our driver.
This reverts commit d97648e5.

Change-Id: Ia08e6f612d80964283aff4a330bbde5001b2450c
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>