drm/msm: add register dumping facility to sde debug

Need the capability to dump the content of sde registers during
panic and other scenarios. Add debugfs facility for triggering
register dumping. Add registration of sde and vbif as base
hardware blocks. Add the blocks within the sde as named register
dumping ranges.

CRs-Fixed: 2005394
Change-Id: I410c4e5270447d4d3a8364287fa61748ead5410f
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>