drm/msm/hdmi: update HDMI_GEN_PKT_CTRL_GENERIC0_UPDATE definition

The GENERIC0_UPDATE field is a single bit. Redefine it as boolean to
simplify its usage in the driver.

Reviewed-by: Abhinav Kumar <[email protected]>
Signed-off-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/639660/
Link: https://lore.kernel.org/r/[email protected]

Author: lumag

drivers/gpu/drm/msm/registers/display/hdmi.xml

@@ -131,7 +131,7 @@ xsi:schemaLocation="https://gitlab.freedesktop.org/freedreno/ rules-fd.xsd">
 		 -->
 		<bitfield name="GENERIC0_SEND" pos="0" type="boolean"/>
 		<bitfield name="GENERIC0_CONT" pos="1" type="boolean"/>
-		<bitfield name="GENERIC0_UPDATE" low="2" high="3" type="uint"/> <!-- ??? -->
+		<bitfield name="GENERIC0_UPDATE" pos="2" type="boolean"/>
 		<bitfield name="GENERIC1_SEND" pos="4" type="boolean"/>
 		<bitfield name="GENERIC1_CONT" pos="5" type="boolean"/>
 		<bitfield name="GENERIC0_LINE" low="16" high="21" type="uint"/>