MIPS: APSP: Remove <asm/kspd.h>

Now that KSPD is gone, kspd.h has no reason to be there.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: kevink@paralogos.com
Cc: macro@linux-mips.org
Cc: john@phrozen.org
Patchwork: https://patchwork.linux-mips.org/patch/5060/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>