input: synaptics_dsx: remove firmware update at boot

Firmware update at boot blocks on waiting for user space
to supply firmware image. Instead start firmware update
from user space when it is ready.

Change-Id: I6c38c25b52942a6946458c320c2285d2fd145486
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>