northbridge/amd/pi: Create common agesawrapper.c

This removes the mainboard agesawrapper.c file from binarypi
based boards and creates a common one.

Change-Id: I900dba914f1c401e4ac732eb93d94b98216e629a
Signed-off-by: Dave Frodin <dave.frodin@se-eng.com>
Reviewed-on: http://review.coreboot.org/8671
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
3 files changed