rebootescrow: skip testing unsupported devices

This HAL is optional, so we should skip devices that do not have it implemented
instead of failing the test.

Bug: 143695053
Bug: 63928581
Test: atest VtsHalRebootEscrowTargetTest
Change-Id: Idaabdbe621cca0b8896377cef6f561b106ea252c
diff --git a/rebootescrow/aidl/vts/functional/VtsHalRebootEscrowTargetTest.cpp b/rebootescrow/aidl/vts/functional/VtsHalRebootEscrowTargetTest.cpp
index f69cf87..cd8cc3e 100644
--- a/rebootescrow/aidl/vts/functional/VtsHalRebootEscrowTargetTest.cpp
+++ b/rebootescrow/aidl/vts/functional/VtsHalRebootEscrowTargetTest.cpp
@@ -26,6 +26,9 @@
 using android::String16;
 using android::hardware::rebootescrow::IRebootEscrow;
 
+#define SKIP_UNSUPPORTED \
+    if (rebootescrow == nullptr) GTEST_SKIP() << "Not supported on this device"
+
 /**
  * This tests that the key can be written, read, and removed. It does not test
  * that the key survives a reboot. That needs a host-based test.
@@ -36,7 +39,6 @@
   public:
     virtual void SetUp() override {
         rebootescrow = android::waitForDeclaredService<IRebootEscrow>(String16(GetParam().c_str()));
-        ASSERT_NE(rebootescrow, nullptr);
     }
 
     sp<IRebootEscrow> rebootescrow;
@@ -59,6 +61,8 @@
 };
 
 TEST_P(RebootEscrowAidlTest, StoreAndRetrieve_Success) {
+    SKIP_UNSUPPORTED;
+
     ASSERT_TRUE(rebootescrow->storeKey(KEY_1).isOk());
 
     std::vector<uint8_t> actualKey;
@@ -67,6 +71,8 @@
 }
 
 TEST_P(RebootEscrowAidlTest, StoreAndRetrieve_SecondRetrieveSucceeds) {
+    SKIP_UNSUPPORTED;
+
     ASSERT_TRUE(rebootescrow->storeKey(KEY_1).isOk());
 
     std::vector<uint8_t> actualKey;
@@ -78,6 +84,8 @@
 }
 
 TEST_P(RebootEscrowAidlTest, StoreTwiceOverwrites_Success) {
+    SKIP_UNSUPPORTED;
+
     ASSERT_TRUE(rebootescrow->storeKey(KEY_1).isOk());
     ASSERT_TRUE(rebootescrow->storeKey(KEY_2).isOk());
 
@@ -87,6 +95,8 @@
 }
 
 TEST_P(RebootEscrowAidlTest, StoreEmpty_AfterGetEmptyKey_Success) {
+    SKIP_UNSUPPORTED;
+
     rebootescrow->storeKey(KEY_1);
     rebootescrow->storeKey(EMPTY_KEY);