clk: qcom: update the parent strings for DSI byte/pixel clocks

Update the parent strings for DSI byte and pixel clocks to match
with the clock names of DSI PLL for QCS405.

Change-Id: I9cde90912a901d9305a5abb2158a261c7cc9555a
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>