drivers/media/video/msm/ledflash.c: Add Sysfs Entries

This will create sysfs entries:
/sys/kernel/testflash/flashon
/sys/kernel/testflash/flashoff
Sill need to work on reading/writing the values. As on now when the flash is on it should set /sys/kernel/testflash/flashon = 1. And when the flash is off /sys/kernel/testflash/flashoff = 1.