Fix the following warning on startup:
[5: swapper/0: 1] WARNING: at ../../../../../../kernel/samsung/msm8976/
drivers/base/core.c:576 device_create_file+0x7c/0xac()
[5: swapper/0: 1] Attribute mode_max: write permission without 'store'
Change-Id: I4806801f9a87eb5c52fa1756f58431362dea7431