Rename export_headers of cc_api_variant

Rename export_headers of cc_api_variant as export_include_dirs, because
the property only supports header directory.

Bug: 244244438
Test: Cuttlefish vendor build succeeded
Change-Id: I6e1468f51694150c70d3b0def2917f0ba74f7ea0
diff --git a/cc/library_stub_test.go b/cc/library_stub_test.go
index e372860..868447a 100644
--- a/cc/library_stub_test.go
+++ b/cc/library_stub_test.go
@@ -308,7 +308,7 @@
 			name: "libbar",
 			variant: "llndk",
 			src: "libbar_llndk.so",
-			export_headers: ["libbar_llndk_include"]
+			export_include_dirs: ["libbar_llndk_include"]
 		}
 
 		api_imports {
@@ -370,7 +370,7 @@
 			variant: "ndk",
 			version: "29",
 			src: "libbar_ndk_29.so",
-			export_headers: ["libbar_ndk_29_include"]
+			export_include_dirs: ["libbar_ndk_29_include"]
 		}
 
 		cc_api_variant {
@@ -378,7 +378,7 @@
 			variant: "ndk",
 			version: "30",
 			src: "libbar_ndk_30.so",
-			export_headers: ["libbar_ndk_30_include"]
+			export_include_dirs: ["libbar_ndk_30_include"]
 		}
 
 		cc_api_variant {
@@ -386,7 +386,7 @@
 			variant: "ndk",
 			version: "current",
 			src: "libbar_ndk_current.so",
-			export_headers: ["libbar_ndk_current_include"]
+			export_include_dirs: ["libbar_ndk_current_include"]
 		}
 
 		api_imports {
@@ -458,7 +458,7 @@
 			variant: "ndk",
 			version: "29",
 			src: "libbar_ndk_29.so",
-			export_headers: ["libbar_ndk_29_include"]
+			export_include_dirs: ["libbar_ndk_29_include"]
 		}
 
 		cc_api_variant {
@@ -466,7 +466,7 @@
 			variant: "ndk",
 			version: "30",
 			src: "libbar_ndk_30.so",
-			export_headers: ["libbar_ndk_30_include"]
+			export_include_dirs: ["libbar_ndk_30_include"]
 		}
 
 		cc_api_variant {
@@ -474,14 +474,14 @@
 			variant: "ndk",
 			version: "current",
 			src: "libbar_ndk_current.so",
-			export_headers: ["libbar_ndk_current_include"]
+			export_include_dirs: ["libbar_ndk_current_include"]
 		}
 
 		cc_api_variant {
 			name: "libbar",
 			variant: "llndk",
 			src: "libbar_llndk.so",
-			export_headers: ["libbar_llndk_include"]
+			export_include_dirs: ["libbar_llndk_include"]
 		}
 
 		api_imports {