modules: mbedtls: Fix init hang issue

In device init phase, it will call _mbedtls_init before malloc_prepare
as mbedtls has higher priority defined in SYS_INIT..
_mbedtls_init() will call psa_crypto_init() and malloc buffer,
but z_malloc_heap is not initialized, which will cause device hang.
Should call malloc_prepare() before _mbedtls_init to fix this issue,
so decrease the priority of mbedtls to default 40.

Signed-off-by: Maochen Wang <[email protected]>

Author: MaochenWang1

modules/mbedtls/zephyr_init.c

@@ -104,7 +104,7 @@ static int _mbedtls_init(void)
 }
 
 #if defined(CONFIG_MBEDTLS_INIT)
-SYS_INIT(_mbedtls_init, POST_KERNEL, 0);
+SYS_INIT(_mbedtls_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
 #endif
 
 /* if CONFIG_MBEDTLS_INIT is not defined then this function