Revert "ANDROID: input: keychord: Add keychord driver"

This reverts commit 08a0437b.

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

.

Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Cc: Mike Lockwood <lockwood@android.com>
Cc: Amit Pundir <amit.pundir@linaro.org>
Bug: 64114943
Bug: 129556081
Change-Id: I6afdb551f273b6d0e25bf4b23cd8b88e39fbe47f