quark_d2000/se: Don't setup GDT during initialization

Quark D2000 and SE based boards (but Arduino 101) use QMSI bootloader
by default. QMSI bootloader sets up GDT in the so-called 'basic flat
model' just like Zephyr does by default.

This patch changes Quark D2000 and SE boards default configuration
so they rely on QMSI bootloader and we don't sets up GDT twice.

Change-Id: Ic6e520148b732bd48c00657c6c8138a8d865faef
Signed-off-by: Andre Guedes <andre.guedes@intel.com>