net: openthread: remove misleading NCP configuration option

Remove `OPENTHREAD_CONFIG_NCP_BUFFER_SIZE` define since it does not
exist in OpenThread.

Signed-off-by: Eduardo Montoya <[email protected]>

Author: edmont

subsys/net/l2/openthread/Kconfig

@@ -222,12 +222,6 @@ config OPENTHREAD_COPROCESSOR_VENDOR_HOOK_SOURCE
 	help
 	  Provides path to compile vendor hook file.
 
-config OPENTHREAD_NCP_BUFFER_SIZE
-	int "The size of the NCP buffers"
-	default 2048
-	help
-	  The size of the NCP buffers.
-
 endif # OPENTHREAD_COPROCESSOR
 
 config OPENTHREAD_PLATFORM_INFO

subsys/net/lib/openthread/platform/openthread-core-zephyr-config.h

@@ -171,16 +171,6 @@
  */
 #define RADIO_CONFIG_SRC_MATCH_EXT_ENTRY_NUM 0
 
-/**
- * @def OPENTHREAD_CONFIG_NCP_BUFFER_SIZE
- *
- * The size of the NCP buffers.
- *
- */
-#ifdef CONFIG_OPENTHREAD_NCP_BUFFER_SIZE
-#define OPENTHREAD_CONFIG_NCP_BUFFER_SIZE CONFIG_OPENTHREAD_NCP_BUFFER_SIZE
-#endif
-
 /**
  * @def OPENTHREAD_CONFIG_PLAT_LOG_MACRO_NAME
  *