Lock down access to getProfiles for 3P apps

MANAGE_USERS permission is not required if calling userId is the same as
requested user id. Theoretically this allows any 3P app to read UserInfo
state including PII fields like name and icon. The change clears PII fields
if the caller doesn't have MANAGE_USERS permission.

Bug: 27705805
Change-Id: Ic69c8cc6aafb7ac72b4fc2b9691cb8e4bef3fb2c