libfdt: Activate testcase for appending properties

Commit a31e3ef83bfce62d07695355e5f06cd4d0e44b86 introduced new libfdt
functions to append to existing properties.  It also included a test case
for this, but neglected to update the Makefile and run_tests.sh script
to actually build and execute this testcase.

This patch corrects the oversight.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/tests/Makefile.tests b/tests/Makefile.tests
index 215a8c5..3f92074 100644
--- a/tests/Makefile.tests
+++ b/tests/Makefile.tests
@@ -12,6 +12,7 @@
 	sw_tree1 \
 	move_and_save mangle-layout nopulate \
 	open_pack rw_tree1 set_name setprop del_property del_node \
+	appendprop1 appendprop2 \
 	string_escapes references path-references phandle_format \
 	boot-cpuid incbin \
 	extra-terminating-null \
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index da6f970..c72b9d2 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -178,6 +178,10 @@
     run_test rw_tree1
     tree1_tests rw_tree1.test.dtb
     tree1_tests_rw rw_tree1.test.dtb
+    run_test appendprop1
+    run_test appendprop2 appendprop1.test.dtb
+    run_dtc_test -I dts -O dtb -o appendprop.test.dtb appendprop.dts
+    run_test dtbs_equal_ordered appendprop2.test.dtb appendprop.test.dtb
 
     for basetree in test_tree1.dtb sw_tree1.test.dtb rw_tree1.test.dtb; do
 	run_test nopulate $basetree