ANDROID: Revert "ANDROID: fs: pipe: wakeup readers on small writes even if pipe had data"

This reverts commit
76879a19 ("ANDROID: fs: pipe: wakeup readers on small writes even if pipe had data")
to replace that with the bug fix that landed upstream at
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3a34b13a88caeb2800ab44a4918f230041b37dd9



Bug: 193851993
Test: Build and boot cuttlefish.

Signed-off-by: Sandeep Patil <sspatil@android.com>
Change-Id: Ic4f5e2cc516b4ea68ae7d63225d1529217990431