input: synaptics_i2c_rmi4: synchronize access to support_fn_list

Synchronize access to support_fn_list to avoid race conditions.

Change-Id: I13b8e99f0c4914046c745b0232a9ce3f792bba47
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>
2 files changed