dt-bindings: power: meson-g12a-power: document ISP power domain

Add MIPI ISP power domain ID to the G12A Power domains bindings header

Signed-off-by: Neil Armstrong <[e-mail]>
Reviewed-by: Daniel Scally <[e-mail]>
Tested-by: Daniel Scally <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

include/dt-bindings/power/meson-g12a-power.h

···
 #define PWRC_G12A_VPU_ID		0
 #define PWRC_G12A_ETH_ID		1
 #define PWRC_G12A_NNA_ID		2
+#define PWRC_G12A_ISP_ID		3
 
 #endif