input: synaptics_fw_update: Modify sysfs fw update names

Modify sysfs entry names so they are standardized across
touchscreen drivers.

This patch is propagated from the msm-3.4 kernel.
(commit: 3afd75a68a38658f1027f30c3cca2ca95b33dd75
input: synaptics_fw_update: Modify sysfs fw update names)

Change-Id: I737bc4a3b55421745caf50fbcfe7137e55626402
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>