panel-jh057n00900: Allow to tie backlight device to panel

This make sure we don't turn on the panel backlight early.

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
Status Job ID Name Coverage
  Build
failed #8352
build

 
  Test
skipped #8354
allowed to fail
code_quality
skipped #8353
test
 
Name Stage Failure
failed
build Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log