drm/vc4: hdmi: Add MISC_CONTROL register for vc4

The MISC_CONTROL register allows configuration of pixel repetition
for pixel doubling in the HDMI block instead of PixelValve.
It was already defined for vc5, so add it for vc4.
Signed-off-by: NDave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20220613144800.326124-29-maxime@cerno.techSigned-off-by: NMaxime Ripard <maxime@cerno.tech>

drivers/gpu/drm/vc4/vc4_hdmi_regs.h

@@ -200,6 +200,7 @@ static const struct vc4_hdmi_register __maybe_unused vc4_hdmi_fields[] = {
 	VC4_HDMI_REG(HDMI_VERTB0, 0x00d0),
 	VC4_HDMI_REG(HDMI_VERTA1, 0x00d4),
 	VC4_HDMI_REG(HDMI_VERTB1, 0x00d8),
+	VC4_HDMI_REG(HDMI_MISC_CONTROL, 0x00e4),
 	VC4_HDMI_REG(HDMI_CEC_CNTRL_1, 0x00e8),
 	VC4_HDMI_REG(HDMI_CEC_CNTRL_2, 0x00ec),
 	VC4_HDMI_REG(HDMI_CEC_CNTRL_3, 0x00f0),