Only install to $OUT/apex for installable apexes

When coverage is enabled there are two variants of the apex, one
installable and one not installable.  Don't try to install files
files to $OUT/apex for the non-installable variant.

Bug: 217453046
Test: m NATIVE_COVERAGE_PATHS="*" NATIVE_COVERAGE_EXCLUDE_PATHS="art bionic/libc device" CLANG_COVERAGE=true USE_HOST_MUSL=true com.android.runtime
Change-Id: I23e58c811ff943b9d5dec025fa619c8db835b29c
diff --git a/apex/builder.go b/apex/builder.go
index 293f388..abbf8ad 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -388,7 +388,7 @@
 
 	imageDir := android.PathForModuleOut(ctx, "image"+suffix)
 
-	installSymbolFiles := !ctx.Config().KatiEnabled() || a.ExportedToMake()
+	installSymbolFiles := (!ctx.Config().KatiEnabled() || a.ExportedToMake()) && a.installable()
 
 	// b/140136207. When there are overriding APEXes for a VNDK APEX, the symbols file for the overridden
 	// APEX and the overriding APEX will have the same installation paths at /apex/com.android.vndk.v<ver>