Revert "ANDROID: keychord: Check for write data size"

This reverts commit f6738522.

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: 73962978
Bug: 129556081
Change-Id: Icaba57e6759f246fb75e28e5f6a84411eddaf953