Use getpwnam()/getgrnam() instead of AID_* macros (libgui)

AID_* values are defined in libcutils private headers and hence
is not exported. Use getpwnam() instead to get these values.

Test: device boots
Bug: 63135587
Change-Id: I417d0472df2170ab190c1c1622117df58292125c
Merged-In: I417d0472df2170ab190c1c1622117df58292125c
1 file changed