drm/i915/hdmi: make hdcp2_msg_data const

It's static const data, make it so.

Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: NRamalingam C <ramalingam.c@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190820134019.13229-5-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_hdmi.c

@@ -1520,7 +1520,7 @@ struct hdcp2_hdmi_msg_data {
 	u32 timeout2;
 };
 
-static struct hdcp2_hdmi_msg_data hdcp2_msg_data[] = {
+static const struct hdcp2_hdmi_msg_data hdcp2_msg_data[] = {
 	{ HDCP_2_2_AKE_INIT, 0, 0 },
 	{ HDCP_2_2_AKE_SEND_CERT, HDCP_2_2_CERT_TIMEOUT_MS, 0 },
 	{ HDCP_2_2_AKE_NO_STORED_KM, 0, 0 },