samples: nrf_rpc: entropy_nrf53: Lower serialization init priority

Lower the serialization initialization priority to the APPLICATION
level. Upstream Zephyr PR #89072 moved part of the nRF53
initializations to the soc_late_init_hook(), which is executed after the
POST_KERNEL initializations. Apparently there was something important
for IPC to work, as the cores failed to communicate if the serialization
was initialized at POST_KERNEL level.

Signed-off-by: Robert Lubos <[email protected]>

Author: rlubos

samples/nrf_rpc/entropy_nrf53/remote/src/entropy_ser.c

@@ -203,4 +203,4 @@ static int serialization_init(void)
 }
 
 
-SYS_INIT(serialization_init, POST_KERNEL, CONFIG_APPLICATION_INIT_PRIORITY);
+SYS_INIT(serialization_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);

samples/nrf_rpc/entropy_nrf53/src/entropy_ser.c

@@ -292,4 +292,4 @@ static int serialization_init(void)
 }
 
 
-SYS_INIT(serialization_init, POST_KERNEL, CONFIG_APPLICATION_INIT_PRIORITY);
+SYS_INIT(serialization_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);