msm: mdss: Add 8084 display clocks

Add new clock structures for 8084 display subsystem. The PLL
programming is same for 8974 and 8084. Hence, the functions
for PLL enable sequence is reused.

Change-Id: Ia8f29227f4688edd84b29337ab1c5787d8ab26a6
Signed-off-by: Shalabh Jain <shalabhj@codeaurora.org>