dt-bindings: power: imx8mn: add defines for DISP blk-ctrl domains

This adds the defines for the power domains provided by the DISP
blk-ctrl.

Signed-off-by: Adam Ford <aford173@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: aford173

include/dt-bindings/power/imx8mn-power.h

@@ -12,4 +12,9 @@
 #define IMX8MN_POWER_DOMAIN_DISPMIX	3
 #define IMX8MN_POWER_DOMAIN_MIPI	4
 
+#define IMX8MN_DISPBLK_PD_MIPI_DSI	0
+#define IMX8MN_DISPBLK_PD_MIPI_CSI	1
+#define IMX8MN_DISPBLK_PD_LCDIF	2
+#define IMX8MN_DISPBLK_PD_ISI	3
+
 #endif