arch: riscv: stacktrace: undo the fp/sp alignment check in zephyrproject-rtos#76045

The change of alignment check in zephyrproject-rtos#76045 could be wrong and
isn't unnecessary to fix the stack traces output, undo it for
now.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>

Author: ycsin

arch/riscv/core/stacktrace.c

@@ -227,10 +227,7 @@ void arch_stack_walk(stack_trace_callback_fn callback_fn, void *cookie,
 static bool in_fatal_stack_bound(uintptr_t addr, const struct k_thread *const thread,
 				 const struct arch_esf *esf)
 {
-	const uintptr_t align =
-		COND_CODE_1(CONFIG_FRAME_POINTER, (ARCH_STACK_PTR_ALIGN), (sizeof(uintptr_t)));
-
-	if (!IS_ALIGNED(addr, align)) {
+	if (!IS_ALIGNED(addr, sizeof(uintptr_t))) {
 		return false;
 	}