msm: mdss: Parse ping pong register from device tree

Ping Pong register bases are different between
8974 v1/v2 and 8x26. Add support to parse ping pong register
bases from device tree.

Change-Id: I2109d1bdc360ef858660fd2ccf49985eaacee8a8
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>
9 files changed