create debian branch only for make debian package.

[master] branch is for the source code develop
[debian] branch is for keep debian package code.

becuase other system like gentoo arch doesn't need the "debian/" folder.

Signed-off-by: Xiangfu Liu <xiangfu@openmobilefree.net>
Acked-by: Li Danbing <lidaobing@gmail.com>

debian/source/format

@@ -1 +0,0 @@
-3.0 (quilt)

debian/source/include-binaries

@@ -1,3 +0,0 @@
-debian/xburst_stage1.bin
-debian/xburst_stage2.bin
-debian/stage1.bin