platform: nordic_nrf: Fix nrf9160 non-secure peripheral regression

Fix regression since target_cfg.c was refactored to a common file
for nrf91 and nrf53.
The I2S and PDM peripheral are not configured as non-secure peripherals.

Change-Id: Ibc2c0caa0694458f2b0071976a7494a0d23f529b
Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
1 file changed