sh: Clean up rsk7264 board settings

Adjusted default settings so that we can boot zImages and uImages.
Removed unused settings, use default commands and where possible
calculate all other settings.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
1 file changed