ARM: keystone_defconfig: enable dsp irq and gpio support

Enable DSP IRQ controller and GPIOs support for Keystone 2.
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NSantosh Shilimkar <ssantosh@kernel.org>

arch/arm/configs/keystone_defconfig

@@ -194,3 +194,5 @@ CONFIG_LEDS_TRIGGER_ONESHOT=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
 CONFIG_LEDS_TRIGGER_BACKLIGHT=y
 CONFIG_LEDS_TRIGGER_GPIO=y
+CONFIG_KEYSTONE_IRQ=y
+CONFIG_GPIO_SYSCON=y