meta-zaius: Override checkstop monitor service env

Override the checkstop monitor service environment file in order to add
the keyboard key number for the Zaius checkstop GPIO pin.

Signed-off-by: Xo Wang <xow@google.com>
Change-Id: I52a3f54d9f10c82c7bffcdc7012c178d97e8124d
2 files changed