[BUG] hartid and cpuid mismatch for RISCV when CONFIG_ARCH_RV_CPUID_MAP is configured

### Description / Steps to reproduce the issue

CONFIG_ARCH_RV_CPUID_MAP is configured

1. bellow code using g_cpux_idlestack to get stack but without translate cpuid to hartid

```
arch/risc-v/src/common/riscv_cpuidlestack.c
//will read stack by cpuid
stack_alloc = (uintptr_t)g_cpux_idlestack(cpu);

```

```
arch/risc-v/src/common/riscv_initialstate.c

// will read stack by cpuid
tcb->stack_alloc_ptr = (void *)g_cpux_idlestack(this_cpu());

```

```
arch/risc-v/src/common/riscv_common_memorymap.h

//using cpuid to read stack
#define g_cpux_idlestack(cpuid) \
(g_idle_topstack - SMP_STACK_SIZE * (CONFIG_SMP_NCPUS - (cpuid)))
```

2. if using customized cpuid to hartid mapping like bellow, stack is wrong.

```
int riscv_hartid_to_cpuid(int hart)
{
#ifdef CONFIG_SMP
int cpu_id = -1;
switch(hart) {
case 0: cpu_id = 0; break;
case 1: cpu_id = 2; break;
case 2: cpu_id = 1; break;
default :
DEBUGASSERT(0);
break;
}
return cpu_id;
#else
return 0;
#endif
}

int riscv_cpuid_to_hartid(int cpu)
{
#ifdef CONFIG_SMP
int hart_id = -1;
switch(cpu) {
case 0: hart_id = 0; break;
case 1: hart_id = 2; break;
case 2: hart_id = 1; break;
default :
DEBUGASSERT(0);
break;
}
return hart_id;
#else
return up_cpu_index();
#endif
}
```

### On which OS does this issue occur?

[OS: Linux]

### What is the version of your OS?

Ubuntu 22.04.4 LTS

### NuttX Version

96f440f0c068f278cc11a956c2c6cf52ff79cf01

### Issue Architecture

[Arch: risc-v]

### Issue Area

[Area: Kernel]

### Host information

qemu to run the rv64
qemu-system-riscv64 --version
QEMU emulator version 10.0.0
Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers

### Verification

- [x] I have verified before submitting the report.

Start with arch/risc-v/src/common/riscv_cpuidlestack.c, arch/risc-v/src/common/riscv_initialstate.c, and arch/risc-v/src/common/riscv_common_memorymap.h, then inspect the cpuid-to-hartid mapping functions shown in the report. Reproduce the configured mapping under QEMU and verify that idle-stack selection remains correct for each CPU; done means the reported mismatch no longer selects the wrong stack.

Written by the indexing model from the issue text.