arch/x86/acpi: Add code for KEY_MENU

Support of MENU key (aka hamburger) for Chromebooks with Vivaldi
keyboard

BUG=b:215038215
TEST=manually tested on Anahera device: pressing T13 key opens menu

Signed-off-by: Boris Mittelberg <bmbm@google.com>
Change-Id: I07873dd9385c743a6512408688ec44a5e97219f9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61835
Reviewed-by: Rajat Jain <rajatja@google.com>
Reviewed-by: Lance Zhao
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/acpi/acpigen_ps2_keybd.c

@@ -55,6 +55,7 @@ static const uint32_t action_keymaps[] = {
 					  KEY_PRIVACY_SCREEN_TOGGLE),
 	[PS2_KEY_MICMUTE] = KEYMAP(0x9b, KEY_MICMUTE),			/* e01b */
 	[PS2_KEY_KBD_BKLIGHT_TOGGLE] = KEYMAP(0x9e, KEY_KBDILLUMTOGGLE),	/* e01e */
+	[PS2_KEY_MENU] = KEYMAP(0xdd, KEY_CONTROLPANEL),	/* e0d5 */
 };
 
 /* Keymap for numeric keypad keys */