input: touchscreen: change linking order of synaptics_i2c_rmi4

On some hardware when synaptics_rmi4_detection_work() is called,
exp_fn_list is still empty because module_init of synaptics_fw_update
is called later. As a result of this sysfs files required for firmware
update are not created. This patch changes the link order to ensure
that exp_fn_list is properly initialized before
synaptics_rmi4_detection_work() is called when all Synaptics modules
i.e. synaptics_fw_update, synaptics_rmi_dev and synaptics_i2c_rmi4 are
statically linked into the kernel.

CRs-fixed: 634135
Change-Id: Ib0b8e82ed569ecb18788b8aec6e1c9771e74fd2d
Signed-off-by: maol <maol@codeaurora.org>