Rename native code coverage paths product variables in Soong.

Rename `CoveragePath` and `CoverageExcludePaths` as
`NativeCoveragePath` and `NativeCoverageExcludePaths` (resp.).
Also rename function `android.CoverageEnabledForPath` as
`android.NativeCoverageEnabledForPath`.

Test: m nothing
Bug: 158212027
Change-Id: Id2c11a638e88088096420b537effa866d7667304
diff --git a/rust/rust_test.go b/rust/rust_test.go
index d658ee2..fe21e3a 100644
--- a/rust/rust_test.go
+++ b/rust/rust_test.go
@@ -89,7 +89,7 @@
 
 	if coverage {
 		config.TestProductVariables.Native_coverage = proptools.BoolPtr(true)
-		config.TestProductVariables.CoveragePaths = []string{"*"}
+		config.TestProductVariables.NativeCoveragePaths = []string{"*"}
 	}
 
 	t.Helper()