ec/starlabs/merlin: Rename the Cezanne EC code

This EC code is for the Byte, a Cezanne Mini PC. The EC is different
to the Cezanne StarBook Mk VI. Rename it to `-desktop`, so the laptop
variant becomes the primary.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I25f812cb1c6cefca1ebbe3bee5d20cf521dd60af
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68319
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/starlabs/merlin/variants/cezanne-desktop/ecdefs.h

@@ -7,8 +7,8 @@
  * EC communication interface for ITE Embedded Controller
  */
 
-#ifndef _EC_STARLABS_CEZANNE_EC_DEFS_H
-#define _EC_STARLABS_CEZANNE_EC_DEFS_H
+#ifndef _EC_STARLABS_CEZANNE_DESKTOP_EC_DEFS_H
+#define _EC_STARLABS_CEZANNE_DESKTOP_EC_DEFS_H
 
 /* IT5570 chip ID byte values */
 #define ITE_CHIPID_VAL		0x5570