ARM: dts: sunxi: Fix OPPs node name

ARM: dts: sunxi: Fix OPPs node name

BugLink: https://bugs.launchpad.net/bugs/1952579
[ Upstream commit ffbe853a3f5a37fa0a511265b21abf097ffdbe45 ]

The operating-points-v2 nodes are named inconsistently, but mostly
either opp_table0 or gpu-opp-table.  However, the underscore is an
invalid character for a node name and the thermal zone binding
explicitly requires that zones are called opp-table-*. Let's fix it.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20210901091852.479202-43-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>