cbmem_console: fix it for x86

The Kconfig options pertaining cbmem console in the preram
environment no longer make sense with the linker script
changes. Remove them and their usage within cbmem_console.

Change-Id: Ibf61645ca2331e4851e748e4e7aa5059e1192ed7
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9851
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/cpu/amd/model_10xxx/Kconfig

@@ -72,9 +72,4 @@ config UDELAY_LAPIC_FIXED_FSB
 	int
 	default 200
 
-config CONSOLE_PRERAM_BUFFER_SIZE
-	hex
-	default 0x0 if CONSOLE_PRERAM_BUFFER_BASE = 0xabadbeef
-	default 0x8000
-
 endif	# CPU_AMD_MODEL_10XXX