Rename PReadAll/PWriteAll for file descriptor ptr to ReadAll/WriteAll am: 4b28024b7b am: d0e2c2e30d am: 8f9f438036

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1491176

Change-Id: I35ae0223303fe83be563845099d2c5cf8e327be2