drivers: wifi: nxp: only enable NXP_WIFI_TC_RELOCATE for RW612

Only by default enable NXP_WIFI_TC_RELOCATE for RW612, which will
relocate traffic API into RAM. But for other platform, for example
the RT series, the ITCM/DTCM is a more suitable place for critical
code.

Signed-off-by: Maochen Wang <maochen.wang@nxp.com>