dev: Move generic serial devices to src/dev/serial

Change-Id: I104227fc460f8b561e7375b329a541c1fce881b2
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/4291
Reviewed-by: Gabe Black <gabeblack@google.com>

src/dev/alpha/backdoor.cc

@@ -52,7 +52,7 @@
 #include "dev/alpha/tsunami_io.hh"
 #include "dev/platform.hh"
 #include "dev/storage/simple_disk.hh"
-#include "dev/terminal.hh"
+#include "dev/serial/terminal.hh"
 #include "mem/packet.hh"
 #include "mem/packet_access.hh"
 #include "mem/physical.hh"

src/dev/alpha/tsunami.cc

@@ -44,7 +44,6 @@
 #include "dev/alpha/tsunami_cchip.hh"
 #include "dev/alpha/tsunami_io.hh"
 #include "dev/alpha/tsunami_pchip.hh"
-#include "dev/terminal.hh"
 
 using namespace std;
 //Should this be AlphaISA?