Only trigger encoder callbacks on primary side (#18467)

Co-authored-by: zvecr <[email protected]>

quantum/encoder/tests/config_mock_split_role.h

@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0, 2 }
+#define ENCODERS_PAD_B \
+    { 1, 3 }
+#define ENCODERS_PAD_A_RIGHT \
+    { 4, 6 }
+#define ENCODERS_PAD_B_RIGHT \
+    { 5, 7 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif