wifi: rename WIFI_BUILD_ONLY_MODE config

Rename variable to a global one to allow
vendors using the same label.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>

Author: sylvioalves

zephyr/src/rw61x/CMakeLists.txt

@@ -32,7 +32,7 @@ if(CONFIG_NXP_MONOLITHIC_WIFI OR CONFIG_NXP_MONOLITHIC_NBU)
 		list(GET signed_binary_blobs_list ${i} signed_binary_blob)
 		if(EXISTS ${signed_binary_blob})
 			list(APPEND binary_blobs_list ${signed_binary_blob})
-		elseif(CONFIG_NXP_WIFI_BUILD_ONLY_MODE)
+		elseif(CONFIG_BUILD_ONLY_NO_BLOBS)
 			message(WARNING "Couldn't find signed firmware ! ${signed_binary_blob}")
 			list(APPEND binary_blobs_list "NOTFOUND")
 		else()