ARM: exynos_defconfig: restore framebuffer support

Commit f611b1e7 ("drm: Avoid circular dependencies for CONFIG_FB")
changed the Kconfig dependencies, so COFNIG_FB is no longer selected in
defconfigs. Restore support for it in exynos_defconfig, because most
Exynos platforms had graphical console running on framebuffer device
emulated on the Exynos DRM drivers.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20210611100204.6240-1-m.szyprowski@samsung.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

arch/arm/configs/exynos_defconfig

@@ -236,6 +236,7 @@ CONFIG_DRM_SII9234=y
 CONFIG_DRM_TOSHIBA_TC358764=y
 CONFIG_DRM_LIMA=y
 CONFIG_DRM_PANFROST=y
+CONFIG_FB=y
 CONFIG_LCD_CLASS_DEVICE=y
 CONFIG_LCD_PLATFORM=y
 CONFIG_BACKLIGHT_PWM=y