L版本开启MTK_SHARED_SDCARD后OTA包放入内卡如何MOTA升级成功

[DESCRIPTION]
L版本开启mtk_SHARED_SDCARD=yes， 并且把OTA包放入内卡，即升级包路径为
：/data/media/0/update.zip，在进行MOTA升级时，重启机器会遇到一直卡在黑屏、但不会进入
recovery mode的现象，仔细检查mtklog发现有如下error：
uncrypt : update package is /data/media/0/update.zip
uncrypt : failed to convert /data/media/0/update.zip to absolute path: Permission denied
[SOLUTION]
解决方法：
修改\alps\device\mediatek\common\sepolicy\uncrypt.te 如下：(其中蓝色为新添加)
# ==============================================
# MTK Policy Rule
# ============
allow uncrypt misc_device:chr_file *;
allow uncrypt platformblk_device:dir *;
allow uncrypt platformblk_device:blk_file *;
allow uncrypt system_data_file:file { open read };
allow uncrypt media_rw_data_file:dir { search getattr };
allow uncrypt media_rw_data_file:file { open read getattr };

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