Analysis of disassembled code in IDA revealed that the stock
libsdmcore is just writing the brightness to a custom sysfs node
in mi_display. Bind mount the real brightness node to that so it
gets written to the real node instead.
Change-Id: I3aa840e50b7a067667b949b0ba1f36d187602547
The idea is to allow us to not depend on stock QTI Bluetooth HAL, as MAC
addresses fetched from NVRAM by nv_mac script will be saved as hex-encoded
files. We can decode back saved files to then the Bluetooth one be set using
persist property so it can be read by Bluetooth HAL.
This is loosely based on similar techniques used on Mi 9 and ZenFone Max Pro M2.
Signed-off-by: Albert I <kras@raphielgang.org>
Change-Id: I74d07c3c3125a04962c37fe8bfcc8385d1fd3398
