Cleanup of recipes for CESdemo

Cleanup of recipes for CESdemo

Small fix to the README.md adding a dependency.

2 fixes for the agl-demo-platform.bb
a) remove porter specifics, they moved to a bbappend in meta-renesas.
b) add CESdemo dependencies and install files in /opt by default.

v2: Fixed typo in agl-demo-platform.bb

v3: Add 'climatecontrolplugin' package to run CES2016 demo.

Change-Id: Id6d2d0b1cdcdf3dbc74309322544e0488a6a003c
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Signed-off-by: Tadao Tanikawa <tanikawa.tadao@jp.panasonic.com>