Rename "Dex2OatBootBackground" to "Dex2OatBackground".

Bug: 261557677
Change-Id: I52e778d13cffcae4212acb05ef2bd62b827fbaf3
Test: Presubmit
Merged-In: I52e778d13cffcae4212acb05ef2bd62b827fbaf3
(cherry picked from commit 473f03bfd9497abe614ea34d96c8b6305c31a1ff)
1 file changed