brcm47xx: image: use "-" separator for device version

This makes legacy subtarget follow two other.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 45319

target/linux/brcm47xx/image/Makefile

@@ -249,13 +249,13 @@ ifeq ($(SUBTARGET),legacy)
   $(eval $(call LinksysDevice,wrt54g3g,W54F,2.20.1))
   $(eval $(call LinksysDevice,wrt54g3g-em,W3GN,2.20.1))
   $(eval $(call LinksysDevice,wrt54g,W54G,4.71.1))
-  $(eval $(call LinksysDevice,wrt54gs_v4,W54s,1.09.1))
+  $(eval $(call LinksysDevice,wrt54gs-v4,W54s,1.09.1))
   $(eval $(call LinksysDevice,wrt150n,N150,1.51.3))
-  $(eval $(call LinksysDevice,wrt160n_v1,N150,1.50.1))
-  $(eval $(call LinksysDevice,wrt300n_v1,EWCB,1.03.6))
-  $(eval $(call NetgearDevice,wgr614_v8,U12H072T00_NETGEAR,2))
-  $(eval $(call NetgearDevice,wndr3300_v1,U12H093T00_NETGEAR,2))
-  $(eval $(call NetgearDevice,wnr834b_v2,U12H081T00_NETGEAR,2))
+  $(eval $(call LinksysDevice,wrt160n-v1,N150,1.50.1))
+  $(eval $(call LinksysDevice,wrt300n-v1,EWCB,1.03.6))
+  $(eval $(call NetgearDevice,wgr614-v8,U12H072T00_NETGEAR,2))
+  $(eval $(call NetgearDevice,wndr3300-v1,U12H093T00_NETGEAR,2))
+  $(eval $(call NetgearDevice,wnr834b-v2,U12H081T00_NETGEAR,2))
 endif
 
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