drm/msm/sde: populate block names and lengths in catalog

Need to read register block length from the DTSI and populate
into the catalog to support register debug dumping. Also add a
name string to each of the blocks for debug purposes.

CRs-Fixed: 2005394
Change-Id: Ia2299a51d649942b9335bc023d098d9c4882f1de
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>