OMAP3: beagle xm: enable up to 800MHz OPP

OMP3630 silicon can enable higher frequencies only depending on the board
characteristics meeting the recommended standards, and has to be selectively
toggled.

Beagle XM uses 3730 variant and the board design allows enabling 800MHz and
1GHz OPPs. However, We need Smart reflex class 1.5 and ABB to enable 1GHz
safely.  For the moment, we tweak the default table to allow for 800Mhz OPP
usage.

Reported-by: Koen Kooi <koen@beagleboard.org>
Tested-by: Koen Kooi <koen@beagleboard.org>

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>