drm/msm/hdmi: drop unused GPIO support

drm/msm/hdmi: drop unused GPIO support

[ Upstream commit 68e674b13b17ed41aac2763d12ece6deaae8df58 ]

The HDMI driver has code to configure extra GPIOs, which predates
pinctrl support. Nowadays all platforms should use pinctrl instead.
Neither of upstreamed Qualcomm platforms uses these properties, so it's
safe to drop them.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/488858/
Link: https://lore.kernel.org/r/20220609122350.3157529-7-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Stable-dep-of: b964444b2b64 ("drm/msm/hdmi: use devres helper for runtime PM management")
Signed-off-by: Sasha Levin <sashal@kernel.org>