package/mesa3d: vc4 backend is an EGL provider

The VC4 GPU does not support full GL, it only provides EGL.

Currently, it is possible to build the VC4 backend without EGL support,
but that does not make sense in the slighest.

So, forcibly enable EGL with VC4, like is done for etnaviv and virgl.

Reported-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/mesa3d/Config.in

@@ -102,6 +102,7 @@ config BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VC4
 	select BR2_PACKAGE_MESA3D_GALLIUM_DRIVER
 	select BR2_PACKAGE_LIBDRM_VC4
 	select BR2_PACKAGE_MESA3D_NEEDS_XA
+	select BR2_PACKAGE_MESA3D_OPENGL_EGL
 	help
 	  Driver for Broadcom VC4 (rpi2/3) GPUs.
 	  It requires a vanilla 4.5+ kernel with drm vc4 (open) support.