kirkwood: add kmod-ata-ahci as default to ix4-200d

kirkwood: add kmod-ata-ahci as default to ix4-200d

The ix4-200d is a 4 bay NAS supported since OpenWrt 23.05. Drive trays
controller. Due to a kernel-related issue with the SATA controller,
trays #1 and #2 were not recognized. This issue has been fixed in
kernel 6.10, so with the adoption of kernel 6.12 in the Kirkwood
target trays #1 and #2 can now be made accessible. This requires the
kmod-ata-ahci package, which this commit adds as default to the
makefile.

Signed-off-by: Sander van Deijck <sander@vandeijck.com>
Link: https://github.com/openwrt/openwrt/pull/19435
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>