video: Add missing dependency for DM_GPIO

Seps driver also requires DM_GPIO to be enabled.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/da8c25c19e5c723ed16a2a6b8494dfb967328567.1643960212.git.michal.simek@xilinx.com
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index cfa08b5..ff8e11f 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -675,7 +675,7 @@
 
 config VIDEO_SEPS525
 	bool "Enable video support for Seps525"
-	depends on DM_VIDEO
+	depends on DM_VIDEO && DM_GPIO
 	help
 	  Enable support for the Syncoam PM-OLED display driver (RGB 160x128).
 	  Currently driver is supporting only SPI interface.