Make serial console for DIR-300-B1 work again.

With some recent change, "console=ttyS1,57600" was removed from the
default kernel command line, this adds the necessary mkcmdline
incantation to image/Makefile to add it there for this target.
This is quite likely broken for other targets as well.

Without this the console switches to ttyS0 instead of ttyS1 and
kernel output is missing, and the userspace comes up with 9600 baud
instead of 57600.

Signed-off-by: Tobias Diedrich <ranma+open...@tdiedrich.de>

Index: target/linux/ramips/image/Makefile
===================================================================
--- target/linux/ramips/image/Makefile  (revision 31538)
+++ target/linux/ramips/image/Makefile  (working copy)
@@ -158,14 +158,14 @@
 mtd_dir300b1_kernel_part_size=917504
 mtd_dir300b1_rootfs_part_size=2949120
 define BuildFirmware/DIR300B1
-       $(call BuildFirmware/Generic,$(1),$(2),board=$(3) $(call 
mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
+       $(call BuildFirmware/Generic,$(1),$(2),$(call 
mkcmdline,$(3),ttyS1,57600) $(call 
mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
        mkwrgimg -s $(4) -d /dev/mtdblock/2 \
                -i $(call sysupname,$(1),$(2)) \
                -o $(call imgname,$(1),$(2))-factory.bin
 endef
 
 define BuildFirmware/DIR300B1/initramfs
-       $(call BuildFirmware/Generic/initramfs,$(1),$(2),board=$(3) $(call 
mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
+       $(call BuildFirmware/Generic/initramfs,$(1),$(2),$(call 
mkcmdline,$(3),ttyS1,57600) $(call 
mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
 endef
 
 define BuildFirmware/Edimax

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