malta: support for coreFPGA6 boards

This patch adds support for running on Malta boards using coreFPGA6
core cards, including support for the msc01 system controller used
with them. The system controller is detected at runtime allowing one
U-boot binary to run on a Malta with either.

Due to the PCI I/O base differing between Maltas using gt64120 & msc01
system controllers, the UART setup is modified slightly. A second UART
is added so that there is one pointing at the correct address for each
system controller. The Malta board then defines its own
default_serial_console function to select the correct one at runtime.
The incorrect UART will simply not function.

Tested on:
  - A coreFPGA6 Malta running interAptiv and proAptiv bitstreams, both
    with and without an L2 cache.
  - QEMU.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
diff --git a/include/pci_ids.h b/include/pci_ids.h
index 2c6dfd4..6bab677 100644
--- a/include/pci_ids.h
+++ b/include/pci_ids.h
@@ -2170,6 +2170,9 @@
 #define PCI_DEVICE_ID_ENE_720		0x1421
 #define PCI_DEVICE_ID_ENE_722		0x1422
 
+#define PCI_VENDOR_ID_MIPS		0x153f
+#define PCI_DEVICE_ID_MIPS_MSC01	0x0001
+
 #define PCI_SUBVENDOR_ID_PERLE          0x155f
 #define PCI_SUBDEVICE_ID_PCI_RAS4       0xf001
 #define PCI_SUBDEVICE_ID_PCI_RAS8       0xf010