configs: meson64: use vidconsole and usbkbd if enabled

Allows displaying the console via video and using a USB keyboard.

Also enables CONFIG_SPLASH_SCREEN if using video.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>