arm64: defconfig: add Panfrost driver

With the goal of making it easier for CI services such as KernelCI to
run tests for it.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm64/configs/defconfig

@@ -504,6 +504,7 @@ CONFIG_DRM_HISI_HIBMC=m
 CONFIG_DRM_HISI_KIRIN=m
 CONFIG_DRM_MESON=m
 CONFIG_DRM_PL111=m
+CONFIG_DRM_PANFROST=m
 CONFIG_FB=y
 CONFIG_FB_MODE_HELPERS=y
 CONFIG_BACKLIGHT_GENERIC=m