Staging: ft1000: Fix Sparse Warning for Static Declarations in boot.h

This patch fixes the Sparse Warning: "symbol 'bootimage'
was not declared. Should it be static?" in boot.h

Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>