Remove legacy WRITE_EXTERNAL_STORAGE permission check for Installers

Bug: 239495492
Test: atest ScopedStorageHostTest#testCheckInstallerAppAccessToObbDirs
Change-Id: I42fdf051366f71011ee7acb614ad063ef73477dc
Merged-In: I42fdf051366f71011ee7acb614ad063ef73477dc
1 file changed