Remove duplicate code

since this code is also under GCM_HW_SET_KEY_CTR_FN macro

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from #20491)

providers/implementations/ciphers/cipher_aes_gcm_hw.c

@@ -55,7 +55,6 @@ static int aes_gcm_initkey(PROV_GCM_CTX *ctx, const unsigned char *key,
         GCM_HW_SET_KEY_CTR_FN(ks, AES_set_encrypt_key, AES_encrypt, NULL);
 # endif /* AES_CTR_ASM */
     }
-    ctx->key_set = 1;
     return 1;
 }