Remove UgBgGroupThrottle node to keep ug_bg_group_throttle 308 by default

Bug: 280258727
Test: Found regression in b/286002292, local test.
Change-Id: I78db6fefe042f0b380e48f1fad5ccb477dd38dbe
Signed-off-by: paulsu <paulsu@google.com>
3 files changed