riscv: qemu: Enable PCI host ECAM generic driver

QEMU 4.0.0 'virt' target integrates a generic ECAM PCI host.
Enable the driver for it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Tested-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
diff --git a/board/emulation/qemu-riscv/Kconfig b/board/emulation/qemu-riscv/Kconfig
index 20ea6dc..2a03e43 100644
--- a/board/emulation/qemu-riscv/Kconfig
+++ b/board/emulation/qemu-riscv/Kconfig
@@ -36,5 +36,9 @@
 	imply OF_BOARD_SETUP
 	imply SIFIVE_SERIAL
 	imply SMP
+	imply PCI
+	imply DM_PCI
+	imply PCIE_ECAM_GENERIC
+	imply CMD_PCI
 
 endif