input: synaptics_fw_update: Add package ID support

Add ability to read package id from sysfs.  Also, only
update firmware when package id of image header file
matches package id on device, except in "force" mode.

Change-Id: I8473508cddcacbd13a580324b6c74ca80ac9d646
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>