Android6.0预装APP升级（白名单）问题

Android6.0预装APP之后，需要跳过未知来源这一选项直接可安装，就需要在packageInstall里面增加累死白名单的设置。

修改如下：

6753_M\alps\packages\apps\PackageInstaller\src\com\android\packageinstaller\PackageInstallerActivity.java

        // Block the install attempt on the Unknown Sources setting if necessary.
        String pkgName = mPkgInfo.packageName;
        if (pkgName.equals("com.rongchat.rchat") || pkgName.equals("com.feeyo.goms.kmg") || pkgName.equals("com.feeyo.guard_dispatch.kmg") ||!requestFromUnknownSource) {
            initiateInstall();  // add rongchat Upgraded white list  by lwz
            return;
        }