Revert "ANDROID: input: keychord: Fix for a memory leak in keychord."

This reverts commit 29be5c0c.

Remove keychord driver, replaced in user space by
https://android-review.googlesource.com/c/677629

.

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 64114943
Bug: 64483974
Bug: 129556081
Change-Id: I4191a02aa70f3c4eb517b9a0ec092380b90130b4