Revert "Emulator: Enhance qemu_pipe.h to handle partial rw"

It broke master
BUG: 36695011

This reverts commit 7b60bd95dfa07e86325b432465fb0043648f6c97.

Change-Id: Idd45acb63b2e6112b4230de2c0609aa8f2092f45
1 file changed