boards: nxp: rd_rw612_bga: set CONFIG_TRUSTED_EXECUTION_SECURE

RD RW612 BGA board is built targeting secure mode execution. If
CONFIG_TRUSTED_EXECUTION_SECURE is not set, base address declarations in
CMSIS header files will be incorrect, causing a variety of issues. Fix
this.

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