Duplicate symbol problem in nuttx

When enabling `CONFIG_DEBUG_LINK_WHOLE_ARCHIVE`, building flat mode nuttx with qemu-rv core always failed.

This is the log when building `flats64`
```
[0/1] Re-running _CMake..._
-- Configuring done (0.3s)
-- Generating done (0.2s)
-- Build files have been written to: /mnt/files/test/cache/mainline/nuttx/build
[1251/1252] Linking C executable nuttx
FAILED: nuttx
: && /mnt/files/test/toolchain/riscv-none-elf/bin/riscv-none-elf-gcc -Wl,-melf64lriscv -Wl,--gc-sections -Wl,--whole-archive -nostdlib -Wl,--entry=__start -Wl,--cref -Wl,-Map=nuttx.map CMakeFiles/nuttx.dir/empty.c.obj -o nuttx -Wl,--script=/mnt/files/test/cache/mainline/nuttx/build/ld.script.tmp -Wl,--start-group arch/libarch.a binfmt/libbinfmt.a drivers/libdrivers.a fs/libfs.a libs/libc/libc.a mm/libmm.a sched/libsched.a boards/libboard.a apps/libapps.a apps/builtin/libapps_builtin.a apps/system/nsh/libapps_nsh.a apps/system/nsh/libapps_sh.a apps/testing/getprime/libapps_getprime.a apps/testing/ostest/libapps_ostest.a apps/examples/hello/libapps_hello.a /mnt/files/test/toolchain/riscv-none-elf/bin/../lib/gcc/riscv-none-elf/13.2.0/rv64imafdc_zicsr/lp64d/libgcc.a -Wl,--end-group && :
/mnt/files/test/toolchain/riscv-none-elf/bin/../lib/gcc/riscv-none-elf/13.2.0/../../../../riscv-none-elf/bin/ld: arch/libarch.a(riscv_allocateheap.c.obj): in function `up_allocate_heap':
/mnt/files/test/cache/mainline/nuttx/arch/risc-v/src/common/riscv_allocateheap.c:70: multiple definition of `up_allocate_heap'; arch/libarch.a(qemu_rv_allocateheap.c.obj):/mnt/files/test/cache/mainline/nuttx/arch/risc-v/src/qemu-rv/qemu_rv_allocateheap.c:115: first defined here
/mnt/files/test/toolchain/riscv-none-elf/bin/../lib/gcc/riscv-none-elf/13.2.0/../../../../riscv-none-elf/bin/ld: warning: nuttx has a LOAD segment with RWX permissions
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
```

I have added `weak_function` to the definition of the function `up_allocate_heap` in riscv_allocateheap.c, but it may selected wrong symbol without enabling `CONFIG_DEBUG_LINK_WHOLE_ARCHIVE`. After googling, I found that ld only uses the first matched symbol in the archive (whether it is strong or weak). Is there any suggestion about how to fix this?