j7elte: fix wifi calibration

Enable macloader to load the correct nvram calibration
data matching the hardware variant.  Since macloader
writes files in /data it needs to rerun after decryption,
requiring running during late_start. Additionally,
calibration data needs to be reloaded every time the driver
is reloaded.

Note that /sys/module/dhd/parameters/nvram_path is cleared
after the driver has accepted the input, you can use
"dhdutil -a wlan0 vars" to confirm that the calibration
data has been applied.

Change-Id: I315d4d88f36f44476415abe5b368373a9d789167