drivers: mcux_flexspi: Default logging to disabled when XIP is used

Program flow will behave incorrectly (memory and instruction fetches
return invalid data) if Flexspi is accessed by the Flexspi driver while
being used as XIP memory by the Cortex M7.

Set logging to disabled by when XIP mode is used in the memc and
flexspi drivers, and warn the user if they attempt to enable it.

Fixes #40133

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>