drm/amd/display/dc/dce110/dce110_compressor: Remove unused function 'dce110_get_requi...

drm/amd/display/dc/dce110/dce110_compressor: Remove unused function 'dce110_get_required_compressed_surfacesize

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_compressor.c:415:6: warning: no previous prototype for ‘dce110_get_required_compressed_surfacesize’ [-Wmissing-prototypes]

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>