mainboard/apple/macbook21/romstage.c: Missing prototype header

Fix warning thrown by Clang due to missing prototype for main
entry point function in -ffreestanding. main() is as any other
function in freestanding and so a prototype is strictly needed.

Change-Id: Ic27e0f93065b1aa85d3979db61b5e2ff0dd2a310
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7518
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
vendorcode/amd/agesa/f*/Porting.h: Sync files across fam's

Sync up these 'Porting.h' headers to include fixes from each
family on botched-up typedef's for primitive data types.

Fix corresponding breakage introduced by typecasts in
mainboards.

Change-Id: I003b155cc6c860f6b0cd75667083634a04814473
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7512
Tested-by: build bot (Jenkins)
vendorcode/amd/agesa/f15?tn: Reduce useless differences

Reduce inconsequential differences between fam15 and
fam15tn to better prepare for possible merger.

Change-Id: I016aa1a4cc45553d51190988d48c8a54cfd85f5a
Signed-off-by: Sara Lelliott <sara@jupitercrash.org>
Reviewed-on: http://review.coreboot.org/7503
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>