Update targets list to the current targets list

targets.list

+ath25/generic
 ar71xx/generic
+ar71xx/mikrotik
+brcm2708/bcm2708
+brcm2708/bcm2709
+brcm2708/bcm2710
+mpc85xx/generic
 ramips/rt305x
 ramips/rt3883
 ramips/mt7620
 ramips/mt7621
 ramips/mt7628
 ramips/mt7688
-lantiq/xrx200
-lantiq/xway
+sunxi/generic
 x86/generic
-x86/64
 x86/geode
-mvebu/generic
-ipq806x/generic
-brcm2708/bcm2708
-brcm2708/bcm2709
-brcm2708/bcm2710
-octeon/generic
-sunxi/generic
-mediatek/generic
-arm64/generic
-armvirt/generic
+x86/64