Tweak tests, consolidate pins target validation (#21254)

buildroot/tests/sanguino644p

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+#
+# Build tests for AVR ATmega 644p
+#
+
+# exit on first failure
+set -e
+
+#
+# Build with the default configurations
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_SANGUINOLOLU_12
+exec_test $1 $2 "Default Configuration" "$3"
+
+# clean up
+restore_configs