arm: apple: Enable PCIe USB controller

Some Apple Silicon machines have a PCIe XHCI controller in additon
to the DWC3 controllers integrated on the SoC.  On the Mac mini
the Type-A ports are handled by this PCIe controller.  Enabling
it allows the use of these ports in U-Boot.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
diff --git a/configs/apple_m1_defconfig b/configs/apple_m1_defconfig
index 4ba0933..b4ecf73 100644
--- a/configs/apple_m1_defconfig
+++ b/configs/apple_m1_defconfig
@@ -15,6 +15,7 @@
 CONFIG_NVME_APPLE=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
+CONFIG_USB_XHCI_PCI=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_SYS_WHITE_ON_BLACK=y
 CONFIG_NO_FB_CLEAR=y