aries | p1: config: enable posix asynchronous i/o

This option enables POSIX asynchronous I/O which may by used
by some high performance threaded applications. Disabling
this option saves about 7k.

Change-Id: Ie6e415aebe34b5f00dac28b0b4f07f4e912fa4a8
Signed-off-by: Humberto Borba <humberos@gmail.com>
aries | p1: backport  enable posix asynchronous i/o from 3.5

Change-Id: I16f20d4f9baa96caa590dea1d1c470941d080065