Revert "ARM: dts: am335x-boneblack: disable RTC-only sleep"

Revert "ARM: dts: am335x-boneblack: disable RTC-only sleep"

This reverts commit b4d98aed93528bddb98c7947999817ff29e4b859.

The latest revision of Beaglebone Black does not support RTC-only mode.

To avoid potential hardware damage, RTC-only mode was disabled by
default by commit 6492f4cb61f1 ("ARM: dts: am335x-boneblack: disable
RTC-only sleep to avoid hardware damage").

Unfortunately, an incorrect fix had already been applied, which instead
of just disabling RTC-only mode, prevents the Beaglebone from powering
down at all.

Revert this patch to fix the power-off regression.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>