tests/kernel/mem_protect/stackprot fails on platform qemu_riscv32

[wentongwu]

Describe the bug
tests/kernel/mem_protect/stackprot fails on platform qemu_riscv32

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -GNinja -DBOARD=qemu_riscv32 ..
3. ninja
4. See error

Screenshots or console output
***** Booting Zephyr OS v1.14.0-rc3-148-g318a98a7fb1f *****
Starts alternate_thread
alternate_thread: Input string is too long and stack overflowed!

Stack Check Fail!
Current thread ID = 0x80000114
Faulting instruction address = 0xdeadbaad
ra: 0xdeadbaad gp: 0xdeadbaad tp: 0xdeadbaad t0: 0xdeadbaad
t1: 0xdeadbaad t2: 0xdeadbaad t3: 0xdeadbaad t4: 0xdeadbaad
t5: 0xdeadbaad t6: 0xdeadbaad a0: 0xdeadbaad a1: 0xdeadbaad
a2: 0xdeadbaad a3: 0xdeadbaad a4: 0xdeadbaad a5: 0xdeadbaad
a6: 0xdeadbaad a7: 0xdeadbaad
Fatal fault in thread 0x80000114! Aborting

Running test suite stackprot

starting test - test_stackprot
Exception cause Illegal instruction (2)
Current thread ID = 0x80000194
Faulting instruction address = 0x80002000
ra: 0x0 gp: 0x0 tp: 0x0 t0: 0x0
t1: 0x0 t2: 0x0 t3: 0x0 t4: 0x15a0
t5: 0x0 t6: 0x0 a0: 0x2040274c a1: 0x204022f4
a2: 0x0 a3: 0x0 a4: 0x0 a5: 0x15a0
a6: 0x0 a7: 0x0
Fatal fault in thread 0x80000194! Aborting.

Environment (please complete the following information):

• OS: (e.g. Linux, MacOS, Windows)
• Toolchain (e.g Zephyr SDK, ...)
• Commit SHA or Version used