arch/x86/acpi: rename KEY_KBDILLUMTOGGLE to KEY_KBD_BKLIGHT_TOGGLE

Also change scan code from e02b to e01e. This is trying to fill the gaps in the standard table. The advise from Googler is using e01e for the keyboard backlight toggle key.

BUG=b:194146863
BRANCH=none
TEST=check on evtest

Signed-off-by: Scott Chao <scott_chao@wistron.corp-partner.google.com>
Change-Id: I402192ff354f30da35aec43202df9f1407911d34
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56763
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/acpi/acpigen_ps2_keybd.c b/src/acpi/acpigen_ps2_keybd.c
index 3890f26..c65790d 100644
--- a/src/acpi/acpigen_ps2_keybd.c
+++ b/src/acpi/acpigen_ps2_keybd.c
@@ -55,7 +55,7 @@
 	[PS2_KEY_PRIVACY_SCRN_TOGGLE] = KEYMAP(0x96,			/* e016 */
 					  KEY_PRIVACY_SCREEN_TOGGLE),
 	[PS2_KEY_MICMUTE] = KEYMAP(0x9b, KEY_MICMUTE),			/* e01b */
-	[PS2_KEY_KBDILLUMTOGGLE] = KEYMAP(0xab, KEY_KBDILLUMTOGGLE),	/* e02b */
+	[PS2_KEY_KBD_BKLIGHT_TOGGLE] = KEYMAP(0x9e, KEY_KBDILLUMTOGGLE),	/* e01e */
 };
 
 /* Keymap for numeric keypad keys */