Add makespecs for standard devices in the OMAP3 family

Add makespecs for standard devices in the OMAP3 family

The beagleboard and Archos gen8 tablets are built on the same hardware
and OpenEmbedded platform build system.
The makespecs enable OpenGL/ES2 support and EGLFS as the default
platform.

Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
Reviewed-by: Donald Carr <donald.carr@nokia.com>
Change-Id: I04938676f82f9136efd662ff3ede16221eadf275
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>