input: hbtp_input: bypass alphabetical and numeric key config

Android thinks hbtp_input is an alphabetical keyboard if these
keys are configured. This brings a mismatch between physical
hardware and Android configuration, and malfunction.

Change-Id: Iedce93d6313b544c85071baa88ba2cc253932e6b
Signed-off-by: Chun Zhang <chunz@codeaurora.org>