ARM64: dts: meson-gx-p23x-q20x: enable the USB controller

ARM64: dts: meson-gx-p23x-q20x: enable the USB controller

BugLink: http://bugs.launchpad.net/bugs/1794889
[ Upstream commit 972cd12a027256061c19c164021f2a771e860438 ]

All S905D (GXL) and S912 (GXM) reference boards (namely these are
P230, P231, Q200 and Q201) provide USB connectors.
This enables the USB controller on these boards to make the USB ports
actually usable.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>