AMD binaryPI: Disable PCI_CFG_EXT_IO

We don't need to do explicit pci_io_read/write operations,
as we can use MMCONF everywhere. AGESA code still enables
extended cf8/cfc should it be needed by payload or OS.

Change-Id: Ib08028bda1b5226bb3b6b67e91f514480a9fc5ee
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17536
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/cpu/amd/pi/00730F01/Kconfig

@@ -15,7 +15,6 @@
 
 config CPU_AMD_PI_00730F01
 	bool
-	select PCI_IO_CFG_EXT
 	select MMCONF_SUPPORT_DEFAULT
 	select X86_AMD_FIXED_MTRRS