clk: msm: mdss: update the procedure for storing DSI PLL codes

In the current implementation, the DSI PLL codes are copied from
a CMA memory which has a no-map attribute. Update the logic by
reading the pre-calibrated DSI PLL codes from physical memory
which is re-mapped to virtual memory allocated in kernel using
ioremap_page_range. Once the DSI PLL codes are stored, free the
reserved CMA memory back to kernel.

Change-Id: Iaa0bbd600dd1a18497cd4dfd7830a9bf88ab0ead
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>