Rename Native_coverage to GcovCoverage in Soong

Pass the NATIVE_COVERAGE Make variable to Soong as the more accurate
GcovCoverage.  Also remove NATIVE_LINE_COVERAGE, it doesn't do anything
different from NATIVE_COVERAGE, and NATIVE_COVERAGE is always set when
NATIVE_LINE_COVERAGE is set.

Bug: 159059537
Test: m checkbuild
Change-Id: Ib26a0e29f09b87400fd8bc41d2c06a4a8a397a19
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 0fce617..f02d0c1 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -113,8 +113,7 @@
 $(call add_json_list, JavaCoveragePaths,                 $(JAVA_COVERAGE_PATHS))
 $(call add_json_list, JavaCoverageExcludePaths,          $(JAVA_COVERAGE_EXCLUDE_PATHS))
 
-$(call add_json_bool, NativeLineCoverage,                $(filter true,$(NATIVE_LINE_COVERAGE)))
-$(call add_json_bool, Native_coverage,                   $(filter true,$(NATIVE_COVERAGE)))
+$(call add_json_bool, GcovCoverage,                      $(filter true,$(NATIVE_COVERAGE)))
 $(call add_json_bool, ClangCoverage,                     $(filter true,$(CLANG_COVERAGE)))
 # TODO(b/158212027): Remove `$(COVERAGE_PATHS)` from this list when all users have been moved to
 # `NATIVE_COVERAGE_PATHS`.