drm/amd/display/dc/dce/dce_stream_encoder: Remove unused variable 'regval'

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

 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_stream_encoder.c: In function ‘dce110_update_generic_info_packet’:
 drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_stream_encoder.c:70:11: warning: variable ‘regval’ set but not used [-Wunused-but-set-variable]

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: George Shen <george.shen@amd.com>
Cc: Eric Bernstein <eric.bernstein@amd.com>
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>