Add PackageManager.isSystemModule() for Spa

package com.android.settingslib.spaprivileged.model.app

import android.content.pm.PackageManager

/**

 * Checks if a package is system module.

 */

fun PackageManager.isSystemModule(packageName: String): Boolean = try {

    getModuleInfo(packageName, 0)

    true

} catch (_: PackageManager.NameNotFoundException) {

    // Expected, not system module

    false

}