drm/msm/sde: define sde specific macros for dmesg logging

Add sde specific macros for dmesg logging that may be enabled
both via drm_debug and via the kernel's dynamic debug.

Change-Id: I25e724fec3e059d9997f3e3383e69223de6e111f
Signed-off-by: Clarence Ip <cip@codeaurora.org>