update android patch README

A previous commit removed hunks from outstanding patches that touch
android-specific files (files not part of tools/testing/selftests).  So
it is no longer necessary to manually ensure these hunks are not
re-applied.

Change-Id: Ifb6ac4cadbff21b37957bd1033ff90a7a413c795
Signed-off-by: Steve Muckle <smuckle@google.com>