health 2.0 vts: Allow for battery-less devices

Battery-less devices reports UNKNOWN for getChargeStatus.
Allow it.

Test: on cuttlefish
Change-Id: I06dd2841d43cab9528209d0bfd61969a8f2409c8
diff --git a/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp b/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
index 49891b7..352a990 100644
--- a/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
+++ b/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
@@ -315,9 +315,7 @@
 TEST_P(HealthHidlTest, getChargeStatus) {
     SKIP_IF_SKIPPED();
     EXPECT_OK(mHealth->getChargeStatus([](auto result, auto value) {
-        EXPECT_VALID_OR_UNSUPPORTED_PROP(
-            result, toString(value),
-            value != BatteryStatus::UNKNOWN && verifyEnum<BatteryStatus>(value));
+        EXPECT_VALID_OR_UNSUPPORTED_PROP(result, toString(value), verifyEnum<BatteryStatus>(value));
     }));
 }