ARM: imx_v6_v7_defconfig: Select LS1021A

Enable CONFIG_SOC_LS1021A by default.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -39,6 +39,7 @@ CONFIG_SOC_IMX6Q=y
 CONFIG_SOC_IMX6SL=y
 CONFIG_SOC_IMX6SX=y
 CONFIG_SOC_VF610=y
+CONFIG_SOC_LS1021A=y
 CONFIG_PCI=y
 CONFIG_PCI_IMX6=y
 CONFIG_SMP=y