mb/purism/librem_14: acpi: Remove unused EC define

The define for color keyboard setting has never been used, as it was
added as a Kconfig selection when ec/system76/ec was introduced.

Change-Id: Iec9134e226382d32783342ef1d37c6f6f6caeb6e
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51946
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
diff --git a/src/mainboard/purism/librem_cnl/variants/librem_14/include/variant/acpi/variant.asl b/src/mainboard/purism/librem_cnl/variants/librem_14/include/variant/acpi/variant.asl
index def6ee0..7f0326d 100644
--- a/src/mainboard/purism/librem_cnl/variants/librem_14/include/variant/acpi/variant.asl
+++ b/src/mainboard/purism/librem_cnl/variants/librem_14/include/variant/acpi/variant.asl
@@ -2,7 +2,6 @@
 
 #define EC_GPE_SWI 0x49 /* GPP_E15 */
 #define EC_GPE_SCI 0x50 /* GPP_E16 */
-#define EC_COLOR_KEYBOARD 0
 #include <ec/system76/ec/acpi/ec.asl>
 
 Scope (\_SB) {