crypto: Fix GType macro for crypto context

The convention is to name the macros PREFIX_TYPE_ and we adhere to
it with other types so we should do that here as well.

src/lib/plugin_apis/crypto.api

@@ -755,7 +755,7 @@ struct _BDCryptoKeyslotContext {
 };
 typedef struct _BDCryptoKeyslotContext BDCryptoKeyslotContext;
 
-#define BD_CRYPTO_KEYSLOT_CONTEXT (bd_crypto_keyslot_context_get_type ())
+#define BD_CRYPTO_TYPE_KEYSLOT_CONTEXT (bd_crypto_keyslot_context_get_type ())
 GType bd_crypto_keyslot_context_get_type();
 
 /**