Rename PSA_ALG_STREAM_CIPHER -> PSA_ALG_STREAM_CIPHER_BASE

Follow the usual naming convention: PSA_ALG_xxx_BASE for a constant
that isn't an algorithm, just used to build one.
diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index f1c8368..95fe42d 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -610,13 +610,14 @@
 #define PSA_ALG_CFB_BASE                        ((psa_algorithm_t)0x04000002)
 #define PSA_ALG_OFB_BASE                        ((psa_algorithm_t)0x04000003)
 #define PSA_ALG_XTS_BASE                        ((psa_algorithm_t)0x04000004)
-#define PSA_ALG_STREAM_CIPHER                   ((psa_algorithm_t)0x04800000)
+
+#define PSA_ALG_STREAM_CIPHER_BASE              ((psa_algorithm_t)0x04800000)
 #define PSA_ALG_CTR                             ((psa_algorithm_t)0x04800001)
 #define PSA_ALG_ARC4                            ((psa_algorithm_t)0x04800002)
 
 #define PSA_ALG_IS_STREAM_CIPHER(alg)            \
     (((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_CIPHER_SUBCATEGORY_MASK)) == \
-        PSA_ALG_STREAM_CIPHER)
+        PSA_ALG_STREAM_CIPHER_BASE)
 
 #define PSA_ALG_CCM                             ((psa_algorithm_t)0x06000001)
 #define PSA_ALG_GCM                             ((psa_algorithm_t)0x06000002)