x86: Rename MMCONF_BASE_ADDRESS and make it common across x86

This setting will be used by more than just ivybridge so make it common.

Also rename it to PCIE_ECAM_BASE which is a more descriptive name.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/include/asm/arch-ivybridge/sandybridge.h b/arch/x86/include/asm/arch-ivybridge/sandybridge.h
index cf7457f..c960525 100644
--- a/arch/x86/include/asm/arch-ivybridge/sandybridge.h
+++ b/arch/x86/include/asm/arch-ivybridge/sandybridge.h
@@ -43,7 +43,7 @@
 #define DEFAULT_EPBAR		0xfed19000	/* 4 KB */
 #define DEFAULT_RCBABASE	0xfed1c000
 /* 4 KB per PCIe device */
-#define DEFAULT_PCIEXBAR	CONFIG_MMCONF_BASE_ADDRESS
+#define DEFAULT_PCIEXBAR	CONFIG_PCIE_ECAM_BASE
 
 /* Device 0:0.0 PCI configuration space (Host Bridge) */
 #define EPBAR		0x40