ARM: dts: sun8i: r40: bananapi-m2-ultra: Remove regulator-always-on

Now that the regulators are tied to the GPIO bank, we can remove the
unneeded regulator-always-on in reg_aldo2

Signed-off-by: Pablo Greco <pgreco@centosproject.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>