Set DISABLED_UNTIL_USED for the correct user in IMMS.

This CL makes If8ff1b2b95c36d33148def2ab87bd006aa520cc0
multi-user aware.

It turns out that DISABLED_UNTIL_USED has not been correctly
set to IMEs seen from secondary users because we have used
  IMMS#mContext.getPackageManager(),
which always returns the PackageManager with the primary
users' context, when specifying
COMPONENT_ENABLED_STATE_DISABLED_UNTIL_USED.

We should use IPackageManager instead as we have already done
in many places of IMMS since Ib23849d352db33f0747aa9d5a178f00.

Bug: 8148605
Bug: 8365223
Bug: 21953608
Change-Id: I4b9d6510bf965204bb1f68c8b527d1a4df23fac4