sim: fix kasan report memalign crash when alignment is 1

(0)Allocating 3 bytes aligned to 0x00000001
=================================================================
==1461685==ERROR: AddressSanitizer: invalid alignment requested in posix_memalign: 1, alignment must be a power of two and a multiple of sizeof(void*) == 4 (thread T0)
    #0 0xf7ab1c2f in __interceptor_posix_memalign ../../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:226

Signed-off-by: ligd <liguiding1@xiaomi.com>

arch/sim/src/sim/posix/sim_hostmemory.c

@@ -156,6 +156,11 @@ void *host_memalign(size_t alignment, size_t size)
   void *p;
   int error;
 
+  if (alignment < sizeof(void *))
+    {
+      alignment = sizeof(void *);
+    }
+
   error = posix_memalign(&p, alignment, size);
   if (error != 0)
     {