Refactored some type EIP712 formatting and hashing code to re-use it

src_features/signMessageEIP712/hash_bytes.h

@@ -0,0 +1,13 @@
+#ifndef HASH_BYTES_H_
+#define HASH_BYTES_H_
+
+#ifdef HAVE_EIP712_FULL_SUPPORT
+
+#include "cx.h"
+
+void hash_nbytes(const uint8_t *const bytes_ptr, uint8_t n, cx_hash_t *hash_ctx);
+void hash_byte(uint8_t byte, cx_hash_t *hash_ctx);
+
+#endif // HAVE_EIP712_FULL_SUPPORT
+
+#endif // HASH_BYTES_H_