AMD model fxx powernow_acpi.c: Fix incorrect loop count

powernow_acpi.c array TDP has 20 entries, yet the loop that reads it
processes 21 entries. This causes a gcc 4.9.2 build failure. Limit
processing to 20 entries.

Change-Id: Ice173b276293184386cd8943a3213f3154f86458
Signed-off-by: Scott Duplichan <scott@notabs.org>
Reviewed-on: http://review.coreboot.org/7791
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
AMD AGESA boards: Prevent passing duplicate obj names to ar

For some of the boards using AMD processors, the Agesa Makefile.inc
is processed twice, causing the list of obj files passed to the ar
command to be added twice. This does not break the build, but does
make the ar command line unnecessarily long.

Change-Id: I02a7e6fc617e337ca2e2dceeff3d4db9995bfe16
Signed-off-by: Scott Duplichan <scott@notabs.org>
Reviewed-on: http://review.coreboot.org/7787
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>