ppc4xx: Change inbound PCIe location for endpoint tests on Katmai

On Yucca & Katmai, the inbound memory map pointed to 0x4.0000.0000, which
is the internal SRAM. Since I now ported and tested this endpoint mode
on Kilauea successfully to map to 0 (SDRAM), I also changed this for
Katmai.

Yucca will stay at internal SRAM for now. Not sure if somebody relies on
this setup.

Signed-off-by: Stefan Roese <sr@denx.de>

include/configs/katmai.h

@@ -73,7 +73,7 @@
 #define CFG_PCIE2_XCFGBASE	0xc3002000
 
 /* base address of inbound PCIe window */
-#define CFG_PCIE_INBOUND_BASE	0x0000000400000000ULL
+#define CFG_PCIE_INBOUND_BASE	0x0000000000000000ULL
 
 /* System RAM mapped to PCI space */
 #define CONFIG_PCI_SYS_MEM_BUS	CFG_SDRAM_BASE