This change replaces kzfree with kfree as kzfree has been
renamed.

While moving to the latest 5.10 tip, additional small changes
were required to resolve compilation issues:

set_dma_ops has moved from dma-mapping to dma-map-ops header.
This change includes the new header file required.

drm_panel_add returns void, this change removes the expected
return value check.

drm_prime_pages_to_sg takes an additional parameter. This change
passes in the drm_device pointer the function is looking for.

Remove an unused variable in sde_crtc vblank function.

Change-Id: I47c085c0cb64432873c2e750ae64cbdc2b5340da
Signed-off-by: Samantha Tran <samtran@codeaurora.org>