Define phone_accounts to fix build breaks.

I'm not sure what happened, but this string is defined in many of the
string.xmls, but not the base one... there are breaks in branches
which lmp-dev merges into because phone_accounts isn't defined. Thus,
adding this definition to fix those breaks.

Bug: 544757
Change-Id: I8457db022eec9402e48dd254b4a2b6c77406ed9d
1 file changed