regulator: dt-bindings: rpi-panel: Split 7" Raspberry Pi 720x1280 v2 binding

regulator: dt-bindings: rpi-panel: Split 7" Raspberry Pi 720x1280 v2 binding

The 5" and 7" Raspberry Pi 720x1280 Display 2 MCU is a bit more
complex than the original Display 1 ATTINY88 and the binding is
also a bit more demanding. Split the binding into separate file
and fill in required gpio-controller, #gpio-cells and #pwm-cells
which must be present for the V2 MCU. Include mention of the 5"
panel in the description of Display 2, as the 5" panel uses the
same MCU.

Fixes: 6d09c6e474bd ("regulator: dt-bindings: rpi-panel: Add regulator for 7" Raspberry Pi 720x1280")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Message-ID: <20250905191637.147141-1-marek.vasut+renesas@mailbox.org>
Signed-off-by: Mark Brown <broonie@kernel.org>