soc: mimxrt798s/hifi4: Disable GPIO support

Remove INPUTMUX interrupt assignments for PINT and GPIO peripherals.
Remove gpio0 DT node.

As the GPIO peripherals can be secured on the mimxrt798s, accesses from
the cm33_cpu0 and hifi4 are mutually exclusive, so the GPIO0 will stay
enabled in the cm33_cpu0 domain.

Signed-off-by: Vit Stanicek <vit.stanicek@nxp.com>