sh: sh7750: move machtypes.h to include/generated

By commit 3252b11f,
machtypes.h moved to include/generated.
However, this forgot kernel/cpu/sh4/setup-sh7750.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>