arm64: defconfig: Enable the EFI Framebuffer

Tested on the Lenovo Yoga C630 where this patch enables the
framebuffer (screen/monitor).  Without it the device appears
not to boot.

Link: https://lore.kernel.org/r/20190903192625.14775-2-lee.jones@linaro.org


Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>