soc/amd/stoneyridge: Remove direct AGESA header includes

All AGESA headers should be included only through agesawrapper.h

BUG=b:66818758
TEST=Build gardenia; Build & boot kahlee

Change-Id: Iadc516e11148048ed9bf43c7a46827793245027a
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/21716
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/amd/stoneyridge/BiosCallOuts.c

@@ -20,7 +20,6 @@
 #include <soc/southbridge.h>
 
 #include <agesawrapper.h>
-#include <AGESA.h>
 #include <amdlib.h>
 #include <dimmSpd.h>