Revert "boards: mimxrt700_evk: Enable NS & NP GPIO0 access"

This reverts commit 40f08428.

The PCNS and ICNS registers of the mimxrt798s's GPIO0 peripheral allow
accesses to be set up only with mutual exclusivity (either the
cm33_cpu0 or the hifi4), thus the access is reverted to the cm33_cpu0
domain.

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