drm: bridge: dw-hdmi: Fix overflow workaround for Amlogic Meson GX SoCs

The Amlogic Meson GX SoCs, embedded the v2.01a controller, has been also
identified needing this workaround.
This patch adds the corresponding version to enable a single iteration for
this specific version.

Fixes: be41fc55 ("drm: bridge: dw-hdmi: Handle overflow workaround based on device version")
Acked-by: Archit Taneja <architt@codeaurora.org>
[narmstrong: s/identifies/identified and rebased against Jernej's change]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1519386277-25902-1-git-send-email-narmstrong@baylibre.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

@@ -1654,6 +1654,8 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 	 * (v1.31a) and multiple Allwinner SoCs (v1.32a) have been identified
 	 * as needing the workaround, with 4 iterations for v1.30a and 1
 	 * iteration for others.
+	 * The Amlogic Meson GX SoCs (v2.01a) have been identified as needing
+	 * the workaround with a single iteration.
 	 */
 
 	switch (hdmi->version) {
@@ -1662,6 +1664,7 @@ static void dw_hdmi_clear_overflow(struct dw_hdmi *hdmi)
 		break;
 	case 0x131a:
 	case 0x132a:
+	case 0x201a:
 		count = 1;
 		break;
 	default: