nrf91: fix cmake compiler error

Signed-off-by: yinshengkai <[email protected]>

Author: Gary-Hobson

arch/arm/src/nrf91/CMakeLists.txt

@@ -144,14 +144,10 @@ if(CONFIG_NRF91_MODEM)
     set(MODEM_LIB_VARIANT libmodem.a)
   endif()
 
-  nuttx_library_import(
-    modem
+  nuttx_add_extra_library(
     ${NRFXLIB_DIR}/nrf_modem/lib/cortex-m33/${NRFXLIB_LIB_VARIANT}/${MODEM_LIB_VARIANT}
   )
   target_include_directories(arch PRIVATE ${NRFXLIB_DIR}/nrf_modem/include)
-
-  target_link_libraries(arch PRIVATE modem)
-  target_link_libraries(modem INTERFACE arch c net)
 endif()
 
 target_sources(arch PRIVATE ${SRCS})