hostap: fix build error of common.h

When build with the psa_crypto_driver, it will try to include common.h
of mbedtls, but actually include the common.h from hostap, and causes
build error of undefined symbol. Use zephyr_interface_library_named
to define hostap, and other modules needs to link the library of hostap
when wants to use the header file in /utils path, such as the common.h.

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