msm: kgsl: Correct the microcode sizes in the GPU snapshot

The stored sizes for the PM4 and PFP microcode in the adreno device
structure were already dword sized, so just store those numbers
directly in the snapshot header.  The stored size include an additional
version dword that isn't actually saved as part of the firmware, so
decrement the stored sizes by one when we read the data back from
the GPU.

Change-Id: Ic0dedbad6d4c5612903c7b6d1b626ccd6246f61c
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>