msm: kgsl: Fix snapshot collection for gmu wrapper registers

Use adreno_read_gmu_wrapper for reading gmu wrapper registers
region for a619_holi target.

Change-Id: Ia9451c2dbc81958f80931a99db5a95a106995e50
Signed-off-by: Pankaj Gupta <gpankaj@codeaurora.org>