msm: clock-pll: Introduce configuration of CONFIG_CTL register

Some PLLs require the configuration of the PLL_CONFIG_CTL registers.
Therefore, add the support for configuring them.

Change-Id: I1a53bd2353c56eaa426504775dcb524d6583f71c
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>