ahci: Make ahci drivers depend on AHCI

At present all ahci drivers depend on AHCI except for DWC_AHCI. But no
boards enable that without also enabling AHCI:

   /tools/moveconfig.py -f ~AHCI DWC_AHCI
   0 matches

Group them together and sort them in order by Kconfig name (except for
AHCI_MVEBU which uses a different naming convention).

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>