msm: display: Add device pointer with clk_get for retrieving clocks

clk_get requires device pointer to return appropriate clocks
for display subsystem. Rename the names of display related clocks
in the lookup table based on functionality.

CRs-Fixed: 336925
Change-Id: I784bc4e650d779d1422a9ff1b9a75e36d669e551
Signed-off-by: Ravishangar Kalyanam <rkalya@codeaurora.org>