[crypto] PSA API: initialize crypto platform for LinkRaw

This commit ensures that OpenThread Platform Crypto Init API is called
for all cases.

Signed-off-by: Łukasz Duda <lukasz.duda@nordicsemi.no>

Author: LuDuda

src/core/mac/link_raw.cpp

@@ -58,6 +58,8 @@ LinkRaw::LinkRaw(Instance &aInstance)
     , mSubMac(aInstance.Get<SubMac>())
 #endif
 {
+    otPlatCryptoInit();
+
     Init();
 }