board/csky: remove host/usr reference from readme.txt

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/csky/readme.txt

@@ -84,5 +84,5 @@ Run
   Setup the Console with the rate 115200/8-N-1.
 
   $ cd output/images
-  $ ../host/usr/bin/csky-linux-gdb -x ../../board/csky/gx6605s/gdbinit vmlinux
+  $ ../host/bin/csky-linux-gdb -x ../../board/csky/gx6605s/gdbinit vmlinux