drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT

drm/bridge: it6505: Change definition MAX_HDCP_DOWN_STREAM_COUNT

A HDCP source device shall support max downstream to 127 devices.
Change definition MAX_HDCP_DOWN_STREAM_COUNT to 127

KSVs shall save for DRM blocked devices check.
This results in struct it6505 growth by ~0.5 KiB.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Hermes Wu <hermes.wu@ite.com.tw>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241230-v7-upstream-v7-4-e0fdd4844703@ite.corp-partner.google.com