ARM: dts: msm: Add GPU clk levels as per MSM8992 clk plan

This change adds a couple of GPU clk levels (490MHz and 367MHz)
as per the updated clk plan. Also adjusts the bus bandwidth
levels as per the DDR/BIMC clk plan.

Change-Id: I3d18d5b0b8ac1c00ca80dd4e5a2545f731f0f7ce
Signed-off-by: Rama Vaddula <rvaddula@codeaurora.org>