bsp: Rename files to include subtarget

Because we might want to support different subtargets
inside a single target in the future, the name is changed
so it includes the subtarget as well.

Signed-off-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

bsp/ar71xx-tiny.bsp

@@ -1,4 +1,4 @@
-machine=ar71xx
+machine=ar71xx-tiny
 chipset=ar71xx
 subtarget=tiny
 images=("openwrt-${chipset}-${subtarget}-archer-c25-v1-squashfs-*"

bsp/ipq806x-generic.bsp

@@ -1,4 +1,4 @@
-machine=ipq806x
+machine=ipq806x-generic
 chipset=ipq806x
 subtarget=generic
 

bsp/mpc85xx-generic.bsp

@@ -1,4 +1,4 @@
-machine=mpc85xx
+machine=mpc85xx-generic
 chipset=mpc85xx
 subtarget=generic
 

bsp/ramips-mt7621.bsp

@@ -1,4 +1,4 @@
-machine=mt7621
+machine=mt7621-generic
 chipset=ramips
 subtarget=mt7621
 

bsp/ramips-mt76x8.bsp

@@ -1,4 +1,4 @@
-machine=mt76x8
+machine=ramips-mt76x8
 chipset=ramips
 subtarget=mt76x8
 images=("openwrt-${chipset}-${subtarget}-tplink_c50-v3-squashfs-*"