arm64: defconfig: Enable Broadcom's STB PCIe controller

For now mainly used in the Raspberry Pi 4.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 6a83ba2..f3259f6 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -190,6 +190,7 @@
 CONFIG_PCI_HOST_THUNDER_PEM=y
 CONFIG_PCI_HOST_THUNDER_ECAM=y
 CONFIG_PCIE_ROCKCHIP_HOST=m
+CONFIG_PCIE_BRCMSTB=m
 CONFIG_PCI_LAYERSCAPE=y
 CONFIG_PCI_HISI=y
 CONFIG_PCIE_QCOM=y