fix(nuttx): use absolute path for fl_port_nuttx.c in CMake SRCS

parent directory, causing the relative path "App/func_loader/
fl_port_nuttx.c" to resolve incorrectly. Use CMAKE_CURRENT_LIST_DIR
to match the existing file(GLOB) pattern.

Signed-off-by: chenjinglin <chenjinglin@xiaomi.com>

Author: C-Ackerman

cmake/nuttx.cmake

@@ -42,7 +42,7 @@ if(CONFIG_FPBINJECT)
     MODULE
     ${CONFIG_FPBINJECT}
     SRCS
-    App/func_loader/fl_port_nuttx.c
+    ${CMAKE_CURRENT_LIST_DIR}/../App/func_loader/fl_port_nuttx.c
     ${FL_SOURCES}
     ${FPB_SOURCES}
     INCLUDE_DIRECTORIES