Filter-out deps of unsupported arch

When a common-arch module (ex: phony) has the "required" dependencies on
native modules (ex: cc_library), both 32 and 64-bit variants of the
native modules are added as dependencies. This by itself is fine and
actually is intended, otherwise there's no way for us to install both
arch variants via required deps.

However, this imposes a problem when the common-arch module is depended
on by a filesystem module with compile_multilib: "first". Here, the
expectation is that only the first variant (64-bit) of the native module
is instaled, but in reality both variants are installed.

To handle this situation, make sure that the packaging routine filters
out packaging specs from unsupported architecture.

Bug: N/A
Test: go test ./... under soong/filesyste

Change-Id: Ie1ad5ace2e5d88e00183a115f4a76e5df87a8166

android/module_context.go

@@ -497,6 +497,7 @@ func (m *moduleContext) packageFile(fullInstallPath InstallPath, srcPath Path, e
 		partition:             fullInstallPath.partition,
 		skipInstall:           m.skipInstall(),
 		aconfigPaths:          m.getAconfigPaths(),
+		archType:              m.target.Arch.ArchType,
 	}
 	m.packagingSpecs = append(m.packagingSpecs, spec)
 	return spec
@@ -622,6 +623,7 @@ func (m *moduleContext) InstallSymlink(installPath InstallPath, name string, src
 		partition:        fullInstallPath.partition,
 		skipInstall:      m.skipInstall(),
 		aconfigPaths:     m.getAconfigPaths(),
+		archType:         m.target.Arch.ArchType,
 	})
 
 	return fullInstallPath
@@ -665,6 +667,7 @@ func (m *moduleContext) InstallAbsoluteSymlink(installPath InstallPath, name str
 		partition:        fullInstallPath.partition,
 		skipInstall:      m.skipInstall(),
 		aconfigPaths:     m.getAconfigPaths(),
+		archType:         m.target.Arch.ArchType,
 	})
 
 	return fullInstallPath