libfdt: Activate testcase for appending properties

Commit a31e3ef83b 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>

tests/Makefile.tests

@@ -12,6 +12,7 @@ LIB_TESTS_L = get_mem_rsv \
 	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 \

tests/run_tests.sh

@@ -178,6 +178,10 @@ libfdt_tests () {
     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