clk: qcom: mdss: remove DSI1 PLL configuration from DSI0 PLL

In the current implementation, DSI0 PLL driver explicitly disables DSI1
PLL at numerous instances to work around a hardware issue that requires
explicitly powering down any unused PLLs whenever MDSS GDSC is toggled.
However, this is not needed anymore since each PLL can independently
power itself down as part of the GDSC notifier worker thread.

Change-Id: Ic56f0ce350dd9ad648f3b96baa753345a74897b0
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>