drm/msm/hdmi: convert clock and regulator arrays to const arrays

As a preparation to the next patches convert 'static const char *'
arrays to 'static const char * const', as required by the checkpatch.pl

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/651705/
Link: https://lore.kernel.org/r/20250505-fd-hdmi-hpd-v5-2-48541f76318c@oss.qualcomm.com


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>