kernel: modules: fix kmod-drm dependency for 5.15

Fixes following issue:

 Package kmod-drm is missing dependencies for the following libraries:
 fb.ko

Introduced upstream in commit f611b1e7624c ("drm: Avoid circular
dependencies for CONFIG_FB") in 5.14.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/kernel/linux/modules/video.mk

@@ -225,7 +225,8 @@ define KernelPackage/drm
   SUBMENU:=$(VIDEO_MENU)
   TITLE:=Direct Rendering Manager (DRM) support
   HIDDEN:=1
-  DEPENDS:=+kmod-dma-buf +kmod-i2c-core +PACKAGE_kmod-backlight:kmod-backlight
+  DEPENDS:=+kmod-dma-buf +kmod-i2c-core +PACKAGE_kmod-backlight:kmod-backlight \
+	+(LINUX_5_15):kmod-fb
   KCONFIG:=CONFIG_DRM
   FILES:= \
 	$(LINUX_DIR)/drivers/gpu/drm/drm.ko \