ARM: dts: sunxi: Fix OPPs node name

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

arm64: dts: allwinner: h6: Use - instead of @ for DT OPP entries

DTC and the dt-validate tools report warnings for opp with the format
opp@$frequency: dtc for a missing reg property, and dt-validate since
the binding requires child nodes to have the format opp-$frequency.

Change this to the latter format.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://lore.kernel.org/r/20210114113538.1233933-16-maxime@cerno.tech

arm64: dts: allwinner: h6: add voltage range to OPP table

Some boards have a fixed regulator and can't reach the voltage set
by the OPP table.

Add a range where the minimal voltage is the target and the maximal
voltage is 1.2V.

Suggested-by: Ondřej Jirman <megous@megous.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

arm64: dts: allwinner: h6: Add CPU Operating Performance Points table

Add an Operating Performance Points table for the CPU cores to
enable Dynamic Voltage & Frequency Scaling on the H6.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>