zephyr: Fix prj.conf for v4.1-rc1.

The (deprecated) kconfig option NET_SOCKETS_POSIX_NAMES was removed in
commit abad505bdeed6102061767f45acd63323973f564 so remove it from our
configuration.

As the option has been deprecated longer, this also works for v3.7 and
v4.0 the other still supported versions.

Signed-off-by: Detlev Zundel <[email protected]>

Author: laodzu

ports/zephyr/prj.conf

@@ -29,7 +29,6 @@ CONFIG_NET_IPV6=y
 CONFIG_NET_UDP=y
 CONFIG_NET_TCP=y
 CONFIG_NET_SOCKETS=y
-CONFIG_NET_SOCKETS_POSIX_NAMES=n
 CONFIG_TEST_RANDOM_GENERATOR=y
 
 CONFIG_NET_CONFIG_SETTINGS=y