Platform: Fix possible stack corruption in platform_sp_nv_read_psa_api()

- Set the counter_val size to NV_COUNTER_SIZE (4).

Signed-off-by: Andrej Butok <andrey.butok@nxp.com>
Change-Id: I134e0b3cc012dbde64669fb6b0e7072def304377
1 file changed