default: update drm_hwcomposer

Update drm_hwcomposer to the lastest upstream version:
a8ef39578ca8 (Merge "Merge remote-tracking branch 'aosp/upstream-main' into uprev" into main, 2025-01-05)

This fixes the 2 following VTS issues:
module: VtsHalGraphicsComposer3_TargetTest
testcase: PerInstance/GraphicsComposerAidlTest
tests:
- SetActiveConfig/0_android_hardware_graphics_composer3_IComposer_default
- SetActiveConfigPowerCycle/0_android_hardware_graphics_composer3_IComposer_default

Change-Id: Id34619ea83accf3dfff645c202fdf2ca743e2bb6
Signed-off-by: Nicolas Belin <nbelin@baylibre.com>