Use getpwnam and getgrnam in libwifi_hal

libwifi_hal is a vendor module, but it was accidentally getting
the core version of the libcutils headers which included
private/android_filesystem_config.h.  Change it to using
getpwnam("wifi") and getgrnam("wifi") instead of AID_WIFI.

Test: m checkbuild
Bug: 63135587
Bug: 114238698
Change-Id: I28f20fd9f4868c0d1e25fda64f477f6d551cc1dd
1 file changed