ARM: imx_v6_v7_defconfig: enable PCI_MSI

This has been stable on i.MX6 for a good while now and there is no
reason to keep it disabled, as it allows to allocate non-shared
IRQs if several PCIe devices are connected to a single host.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index 486b02b..2d5253d 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -44,6 +44,7 @@
 CONFIG_SOC_IMX7D=y
 CONFIG_SOC_VF610=y
 CONFIG_PCI=y
+CONFIG_PCI_MSI=y
 CONFIG_PCI_IMX6=y
 CONFIG_SMP=y
 CONFIG_PREEMPT_VOLUNTARY=y