bcm53xx: fix Asus RT-AC87U magic (even if not used yet)

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

SVN-Revision: 44933

target/linux/bcm53xx/image/Makefile

@@ -82,7 +82,7 @@ define Image/Build
 	( cd $(KDIR); $(STAGING_DIR_HOST)/bin/ubinize -p 128KiB -m 2048 -o $(KDIR)/root-block-0x20000-min-0x800.ubi ubinize.cfg )
 
 	$(call Image/Build/AsusTrx,$(1),bcm47081-asus-rt-n18u,nand-0x20000-0x800,RT-N18U)
-	$(call Image/Build/AsusTrx,$(1),bcm4709-asus-rt-ac87u,nand-0x20000-0x800,RT-N18U)
+	$(call Image/Build/AsusTrx,$(1),bcm4709-asus-rt-ac87u,nand-0x20000-0x800,RT-AC87U)
 
 	$(call Image/Build/Chk,$(1),bcm4708-netgear-r6250,nand-0x20000-0x800,U12H245T00_NETGEAR,1)
 	$(call Image/Build/Chk,$(1),bcm4708-netgear-r6300-v2,nand-0x20000-0x800,U12H240T00_NETGEAR,1)