Rename ECAM-specific MMCONF Kconfigs

Currently, the MMCONF Kconfigs only support the Enhanced Configuration
Access mechanism (ECAM) method for accessing the PCI config address
space.  Some platforms have a different way of mapping the PCI config
space to memory.  This patch renames the following configs to
make it clear that these configs are ECAM-specific:

- NO_MMCONF_SUPPORT --> NO_ECAM_MMCONF_SUPPORT
- MMCONF_SUPPORT --> ECAM_MMCONF_SUPPORT
- MMCONF_BASE_ADDRESS --> ECAM_MMCONF_BASE_ADDRESS
- MMCONF_BUS_NUMBER --> ECAM_MMCONF_BUS_NUMBER
- MMCONF_LENGTH --> ECAM_MMCONF_LENGTH

Please refer to CB:57861 "Proposed coreboot Changes" for more
details.

BUG=b:181098581
BRANCH=None
TEST=./util/abuild/abuild -p none -t GOOGLE_KOHAKU -x -a -c max
     Make sure Jenkins verifies that builds on other boards

Change-Id: I1e196a1ed52d131a71f00cba1d93a23e54aca3e2
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57333
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/arch/x86/include/arch/pci_io_cfg.h

@@ -69,7 +69,7 @@ void pci_io_write_config32(pci_devfn_t dev, uint16_t reg, uint32_t value)
 	outl(value, 0xCFC);
 }
 
-#if !CONFIG(MMCONF_SUPPORT)
+#if !CONFIG(ECAM_MMCONF_SUPPORT)
 
 /* Avoid name collisions as different stages have different signature
  * for these functions. The _s_ stands for simple, fundamental IO or

src/arch/x86/include/arch/pci_ops.h

@@ -4,7 +4,7 @@
 #define ARCH_I386_PCI_OPS_H
 
 #include <arch/pci_io_cfg.h>
-#if CONFIG(MMCONF_SUPPORT)
+#if CONFIG(ECAM_MMCONF_SUPPORT)
 #include <device/pci_mmio_cfg.h>
 #endif