AGESA,binaryPI: Move PORT80 selection to C bootblock

Because the function is implemented in C, post_code() calls
from cache_as_ram.S and other early assembly entry files may
not currently work for cold boots. Assembly implementation
needs to follow one day.

This effectively removes PORT80 routing from boards with
ROMCC_BOOTBLOCK.

Change-Id: I71aa94b33bd6f65e243724810472a440e98e0750
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37451
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>

src/console/Kconfig

@@ -417,6 +417,7 @@ config POST_DEVICE
 choice
 	prompt "Device to send POST codes to"
 	depends on POST_DEVICE
+	default POST_DEVICE_LPC if DEFAULT_POST_ON_LPC
 	default POST_DEVICE_NONE
 
 config POST_DEVICE_NONE
@@ -429,6 +430,10 @@ config POST_DEVICE_PCI_PCIE
 	depends on PCI
 endchoice
 
+config DEFAULT_POST_ON_LPC
+	bool
+	default n
+
 config POST_IO
 	bool "Send POST codes to an IO port"
 	depends on PC80_SYSTEM && !NO_POST