Timer: make ram_quota and stack platform-dependent

os/include/timer_session/connection.h

@@ -28,7 +28,8 @@ namespace Timer {
 			 * we donate two pages. One of them is used as stack for the
 			 * timer thread and the other page holds the session meta data.
 			 */
-			Genode::Connection<Session>(session("ram_quota=8K")),
+			Genode::Connection<Session>(session("ram_quota=%zd",
+			                                    sizeof(Genode::addr_t)*2048)),
 
 			Session_client(cap())
 		{ }

os/src/drivers/timer/foc/timer_session_component.h

@@ -55,7 +55,7 @@ static Fiasco::l4_timeout_s mus_to_timeout(unsigned int mus)
 
 namespace Timer {
 
-	enum { STACK_SIZE = 4096 };
+	enum { STACK_SIZE = 1024 * sizeof(Genode::addr_t) };
 
 	/**
 	 * Timer session