input: synaptics_fw_update: Rectify the package_id parsing

Rectify the package id parsing which aborts firmware upgradation
due to package id mismatch.

This patch is propagated from msm-3.10 kernel
(commit: 649c7a4d9a43e9eae3ce9cdbd0bf56aac6a63b09
input: synaptics_fw_update: Rectify the package_id parsing)

CRs-Fixed: 574411
Change-Id: Ib047b8824e270c4ab57c7524c74dfb4dac9378f1
Signed-off-by: Sarada Prasanna Garnayak <c_sgarna@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>