openssl: Use linux-latomic target for ARC

Some atomic ops for 32-bit ARC processors are implemented in GCC's libatomic.
For example those dealing with 64-bit data (e.g. __atomic_load_8()) as well as
some others. That said it's required to add "-latomic" for successful linkage.

Otherwise error messages like this happen on OpenSSL building for ARC:
------------------------------->8------------------------------
| ...ld: libcrypto.a(libcrypto-lib-threads_pthread.o): in function `CRYPTO_atomic_or':
| .../openssl-3.0.0/crypto/threads_pthread.c:219: undefined reference to `__atomic_is_lock_free'
| ...ld: .../openssl-3.0.0/crypto/threads_pthread.c:219: undefined reference to `__atomic_is_lock_free'
| ...ld: .../openssl-3.0.0/crypto/threads_pthread.c:220: undefined reference to `__atomic_fetch_or_8'
------------------------------->8------------------------------

Fix that by using a special target, which does exactly what's needed.
See [1] and [2] for more details on the matter.

[1] https://github.com/openssl/openssl/commit/cdf2986a70d92668d882eb29737225f1aaafd0f1
[2] https://github.com/openssl/openssl/pull/15640

(From OE-Core rev: f48227a192022c604f8c2ea4fe973c6664861101)

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/openssl/openssl_3.0.0.bb

@@ -70,6 +70,9 @@ do_configure () {
 	esac
 	target="$os-${HOST_ARCH}"
 	case $target in
+	linux-arc)
+		target=linux-latomic
+		;;
 	linux-arm*)
 		target=linux-armv4
 		;;