make all of the turbolaser stuff only compile if ALPHA_TLASER

is defined.

build/SConstruct:
    Default ALPHA_TLASER to false
dev/uart8250.cc:
    fix paths

--HG--
extra : convert_revision : 3616b5b4b9060860a73568a4ed4f1e8eb991938f

python/m5/objects/Uart.py

@@ -10,6 +10,7 @@ class Uart(PioDevice):
 class Uart8250(Uart):
     type = 'Uart8250'
 
-class Uart8530(Uart):
-    type = 'Uart8530'
+if build_env['ALPHA_TLASER']:
+    class Uart8530(Uart):
+        type = 'Uart8530'