Restructure the way driver contexts are declared

Drivers (both built-in and external) need to declare their context
structures in a way such that they are accessible by the
to-be-autogenerated crypto_driver_contexts.h file. That file lives in
include/psa, which means all builtin driver context structure
declarations also need to live in include/psa.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>

include/psa/crypto_struct.h

@@ -70,7 +70,7 @@ extern "C" {
 #include "mbedtls/gcm.h"
 
 /* Include the context definition for the compiled-in drivers */
-#include "../../library/psa_crypto_driver_wrappers_contexts.h"
+#include "psa/crypto_driver_contexts.h"
 
 typedef struct {
     /** Unique ID indicating which driver got assigned to do the