drm/meson: drop unused static dw_hdmi_dwc_write_bits

static inline dw_hdmi_dwc_write_bits() function is not used at all:

  drivers/gpu/drm/meson/meson_dw_hdmi.c:276:20: error: unused function 'dw_hdmi_dwc_write_bits' [-Werror,-Wunused-function]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240908-regmap-config-const-v1-1-28f349004811@linaro.org


[narmstrong: s/staitc/static/]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240908-regmap-config-const-v1-1-28f349004811@linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20240902113320.903147-2-liaochen4@huawei.com