ARM: imx_v6_v7_defconfig: Select PCI support

Let PCI driver be enabled by default.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -39,6 +39,8 @@ CONFIG_SOC_IMX53=y
 CONFIG_SOC_IMX6Q=y
 CONFIG_SOC_IMX6SL=y
 CONFIG_SOC_VF610=y
+CONFIG_PCI=y
+CONFIG_PCI_IMX6=y
 CONFIG_SMP=y
 CONFIG_VMSPLIT_2G=y
 CONFIG_PREEMPT_VOLUNTARY=y