targets: replace madwifi in profiles with ath5k, madwifi is unmaintained

target/linux/adm5120/router_le/profiles/Compex.mk

target/linux/adm5120/router_le/profiles/RB1xx.mk

target/linux/ar71xx/nand/profiles/02-ath5k.mk

target/linux/au1000/au1500/profiles/Atheros.mk

target/linux/au1000/au1500/profiles/InternetBox.mk

target/linux/brcm47xx/profiles/105-Atheros.mk

target/linux/brcm47xx/profiles/WGT634U.mk

target/linux/brcm47xx/profiles/WL500GPv1-ATH.mk

target/linux/brcm63xx/profiles/102-Atheros.mk

target/linux/etrax/profiles/101-vhdl-nofb.mk

target/linux/ixp4xx/generic/profiles/100-Default.mk

target/linux/ixp4xx/generic/profiles/200-NSLU2.mk

target/linux/ixp4xx/generic/profiles/300-NAS100d.mk

target/linux/ixp4xx/generic/profiles/400-DSMG600RevA.mk

target/linux/ixp4xx/harddisk/profiles/100-FSG3.mk

target/linux/lantiq/danube/profiles/002-arcadyan.mk