Revert "ARM: dts: am335x-boneblack: Enable 1GHz OPP for cpu"

This reverts commit c36e6ec9

.

The original commit updated the cpufreq operating points tables for
am335x-boneblack but was merged before the driver making use of the node
was merged, which breaks the existing cpufreq implementation on the
system, so revert the patch until the ti-cpufreq driver is merged.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>