Update platform tests to use '.test' folder

buildroot/share/tests/LPC1768_tests

@@ -3,8 +3,11 @@
 # exit on first failure
 set -e
 
-restore_configs
+env_backup
+
 opt_set MOTHERBOARD BOARD_RAMPS_14_RE_ARM_EFB
+update_defaults
+
 exec_test $1 $2 "Build Re-ARM Default Configuration"
 
 restore_configs
@@ -60,5 +63,4 @@ opt_enable FAN_SOFT_PWM SDSUPPORT
 opt_enable USE_XMAX_PLUG
 exec_test $1 $2 "MKS SBASE Many less common options"
 
-#clean up
-restore_configs
+env_restore