health 2.0 vts: Allow for battery-less devices

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

Bug: 148425928

Test: on cuttlefish
Change-Id: I06dd2841d43cab9528209d0bfd61969a8f2409c8
(cherry picked from commit 5ac6f5bc992c2a54fe4f2864264e9afc9909485c)
diff --git a/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp b/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
index 6e13a98..bb08c5e 100644
--- a/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
+++ b/health/2.0/vts/functional/VtsHalHealthV2_0TargetTest.cpp
@@ -331,9 +331,7 @@
 TEST_F(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));
     }));
 }