Due to a kernel bug and no available sources we have to work around the
MEMERASE ioctl - if used, it hangs and never returns. I straced the original
recovery executable and could see that it is simply calling write() with a
bunch of zeroes instead of using MEMERASE.
Added a hack that does the same and now the resulting TWRP recovery image works.
Change-Id: I1b1c1c9e870e350776346bdca5d442c7ef565aa0