Fix test failures on HSUM build

- In setup, call switch user which will set up the mocks for
  the user on the device -- necessary for HSUM build where
  the user isn't 0
- Set the user on the group entry builder (it defaults
  to 0 which will fail on HSUM).

Flag: EXEMPT test fix
Test: atest BubblesTest on HSUM build
      (lunch tangorpro_hsum-trunk_staging-eng)
Bug: 384280396
Change-Id: Ifec01bba0494988351058f1f96bacb8ac098df6a
2 files changed