RISC-V Devicetree fixes for v6.9-rc4+

StarFive:
Three fixes, all for the VisionFive 2. The first removes a clearly
bogus PMIC interrupt that looks innocuous at first glance, as "0" would
be a valid interrupt number for a GPIO and that is what I expected to be
used for an external PMIC's interrupt. It is actually a PLIC interrupt
and the 0 was used here to satisfy a driver requirement for an interrupt
that was subsequently relaxed. The schematics of the board show this
PMIC interrupt to not be connected.
The other two fixes remove from the dts pin configuration for add-on boards
which are actually on Raspberry PI compatible hats so should never have
been added to the dts for the board. Emil spotted it because both devices
try to claim the same pins.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
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