[NXP][rw61x] Adding nxp_ota and nxp_factory_data as they are now mandatory

Signed-off-by: Gatien Chapon <gatien.chapon@nxp.com>

Author: chapongatien

src/platform/nxp/rt/rw61x/BUILD.gn

@@ -22,6 +22,9 @@ import("${nxp_sdk_build_root}/nxp_sdk.gni")
 
 assert(chip_device_platform == "nxp")
 
+source_set("nxp_factory_data") {}
+source_set("nxp_ota") {}
+
 config("nxp_platform_config") {
   defines = [ "EXTERNAL_BLEMANAGERIMPL_HEADER=\"platform/nxp/common/ble_zephyr/BLEManagerImpl.h\"" ]
   include_dirs = [