ec/google/chromeec/acpi/ec: add scope comment to nested #endif

To make the code slightly easier to read, add a comment about the scope
to the #endif of the outer #ifdef block.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ic2bc83c77750cd8a509f4755fdfa4daaf082d754
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72137
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Caveh Jalali <caveh@chromium.org>

src/ec/google/chromeec/acpi/ec.asl

@@ -128,7 +128,7 @@ Device (EC0)
 		Name (_PRW, Package () { EC_ENABLE_WAKE_PIN, 0x5 })
 #endif
 	}
-#endif
+#endif /* EC_ENABLE_LID_SWITCH */
 
 	Method (TINS, 1, Serialized)
 	{