[Bug] Fix compile issues for boards with custom matrix (#14323)

keyboards/matrix/noah/matrix.c

@@ -26,6 +26,17 @@ static matrix_row_t matrix_debouncing[MATRIX_COLS];
 static bool debouncing = false;
 static uint16_t debouncing_time = 0;
 
+// user-defined overridable functions
+
+__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
+
+__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
+
+__attribute__((weak)) void matrix_init_user(void) {}
+
+__attribute__((weak)) void matrix_scan_user(void) {}
+
+// helper functions
 void matrix_init(void)
 {
     //debug_enable = true;