Pass current brightness parameter to libtonemap

Because HWUI does not receive continuous information about the current
display brightness from display manager, HWUI just hardcode 1000 nits
for the current display brightness for HLG tone-mapping.

Bug: 206035964
Test: builds
Change-Id: Ifa66c9526c330b3c314a40e192d5c2e67f00cc38
1 file changed