UBUNTU: SAUCE: ARM: OMAP: Add macros for comparing silicon revision

UBUNTU: SAUCE: ARM: OMAP: Add macros for comparing silicon revision

BugLink: http://bugs.launchpad.net/bugs/608095

Adapted from arago project patch by Sanjeev Premi <premi@ti.com>

This helps provide the required setup to enable USB Ethernet (usb0) and
USB host on the XM Beagleboard (A rev).  This will be submitted upstream
by Steve Sakoman.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Lee Jones <lee.jones@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>