libpayload: i8042: Enable keyboard translation by default on exit

Add a Kconfig option to set the keyboard translation state on exit and
set the default to true.  This restores the keyboard to the power-up
defaults for firmware that does not always run libpayload keyboard init
to have consistent state, and provides an option to disable translation
for keyboards that might need it.

Change-Id: I25dfe3f425a5bb57e97476564886672b707aa3bd
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52737
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

payloads/libpayload/Kconfig

@@ -385,6 +385,11 @@ config PC_KEYBOARD_LAYOUT_DE
 	depends on PC_KEYBOARD
 	default n
 
+config PC_KEYBOARD_TRANSLATION
+	bool "Enable or Disable translation in PC keyboard set 2 on exit"
+	depends on PC_KEYBOARD
+	default y
+
 endmenu
 
 menu "Drivers"

payloads/libpayload/drivers/i8042/keyboard.c

@@ -658,7 +658,7 @@ void keyboard_disconnect(void)
 	/* Nobody but us seems to still use scancode set #1.
 	   So try to hand over with more modern settings. */
 	set_scancode_set(2);
-	i8042_set_kbd_translation(false);
+	i8042_set_kbd_translation(CONFIG(LP_PC_KEYBOARD_TRANSLATION));
 
 	/* Send keyboard disconnect command */
 	i8042_cmd(I8042_CMD_DIS_KB);