ARM: shmobile: Enable R-Car Gen 2 PCIe in shmobile_defconfig

The R-Car Gen 2 PCIe driver provides PCIe host support for
Renesas R-Car Gen2 platforms. To increase hardware support enable
the driver in the shmobile_defconfig multiplatform configuration.

Cc: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/shmobile_defconfig

@@ -24,6 +24,7 @@ CONFIG_PL310_ERRATA_588369=y
 CONFIG_ARM_ERRATA_754322=y
 CONFIG_PCI=y
 CONFIG_PCI_RCAR_GEN2=y
+CONFIG_PCI_RCAR_GEN2_PCIE=y
 CONFIG_SMP=y
 CONFIG_SCHED_MC=y
 CONFIG_HAVE_ARM_ARCH_TIMER=y