msm: kgsl: Revisit the GPU snapshot dumping

Add a new linux header to support 64 bit pagetable address in Linux OS
section.
Add a new linux context header to support v2+ Linux version in Linux
context section.
Remove multiple register reads on CP IB registers and have a single
CP register read to get the active IB information.
Add Active IBs to obj_list in case static snapshot blob is not having
enough memory, so that it get dumped into dynamic blob.
Add a message in case any active IB is not getting dumped into snapshot
binary.

Change-Id: Icee01f6ba95e469acac9eed6bf2fdbc83947f5a8
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>