drm/msm: Allocate memory for disp snapshot with kvzalloc()

drm/msm: Allocate memory for disp snapshot with kvzalloc()

With the "drm/msm: add a display mmu fault handler" series [1] we saw
issues in the field where memory allocation was failing when
allocating space for registers in msm_disp_state_dump_regs().
Specifically we were seeing an order 5 allocation fail. It's not
surprising that order 5 allocations will sometimes fail after the
system has been up and running for a while.

There's no need here for contiguous memory. Change the allocation to
kvzalloc() which should make it much less likely to fail.

[1] https://lore.kernel.org/r/20240628214848.4075651-1-quic_abhinavk@quicinc.com/

Fixes: 98659487b845 ("drm/msm: add support to take dpu snapshot")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/619658/
Link: https://lore.kernel.org/r/20241014093605.2.I72441365ffe91f3dceb17db0a8ec976af8139590@changeid
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>