Grants SysUI access to all packages on device

With the new go/app-enumeration feature in R, apps will need to declare
the packages that they have access to or hold the QUERY_ALL_PACKAGES
permission. This change updates sysUI to acquire that permission so it
can act on any app on device.

Test: Device starts without sysui being blocked
Bug: 136675067
Change-Id: Ib88434c17a42936a48095ea040c4e40590a8898f