ARM: dts: omap3-n900: Specify peripherals LDO regulators initial mode

Without that, regulators are left in the mode last set by the bootloader or
by the kernel the device was rebooted from. This leads to various problems,
like non-working peripherals.

Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>