clk: msm: mdss: Change PLL/PHY status messages to debug level

The utility functions to check for PLL lock status and PHY ready
status should only report the status, and log messages for
debug/information purposes. The caller must decide on how to
treat the return value, and log appropriately depending on the
use case.

Change-Id: Id369b8c4e326d71a071a244e3de432efe89bd483
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>