sh: mach-ecovec24: Remove un-defined settings for VPU

The setting of VPU need not be changed from default.
And current setting value is not defined on SH7724

Reported-by: Goda Yusuke <goda.yusuke@renesas.com>
Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>