nb/i945: Drop CHANNEL_XOR_RANDOMIZATION selection

CHANNEL_XOR_RANDOMIZATION is configurable for no reason.

Change-Id: I31e6ed6cb040dcba756cbfd2247d90753d372915
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32928
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/mainboard/getac/p470/Kconfig

@@ -32,7 +32,6 @@ config BOARD_SPECIFIC_OPTIONS
 	select HAVE_ACPI_RESUME
 	select UDELAY_LAPIC
 	select BOARD_ROMSIZE_KB_1024
-	select CHANNEL_XOR_RANDOMIZATION
 	select INTEL_INT15
 	select I945_LVDS