vendor.sh readcfg: split the -b coreboot command

just add a line break to make the code more readable

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/vendor.sh

@@ -278,6 +278,7 @@ readcfg()
 	kbc1126_ec_dump="$PWD/$cbdir/util/kbc1126/kbc1126_ec_dump"
 	cbfstool="elf/cbfstool/$tree/cbfstool"
 	ifdtool="elf/ifdtool/$tree/ifdtool"
+
 	x_ ./update trees -b coreboot utils $tree
 }