split uart into urt8250 and uart8530

fix some doxygen comments

SConscript:
    Added split uart files
dev/ns_gige.cc:
dev/ns_gige.hh:
dev/ns_gige_reg.h:
dev/tsunami.cc:
dev/tsunami_cchip.cc:
dev/tsunami_io.cc:
dev/tsunami_pchip.cc:
dev/tsunamireg.h:
    fix doxgyen file comment
dev/uart.cc:
dev/uart.hh:
python/m5/objects/Uart.py:
    split uart into urt8250 and uart8530

--HG--
extra : convert_revision : 2e70aad892a37620d7909017648bca6d7d69d678

python/m5/objects/Uart.py

@@ -3,5 +3,13 @@ from Device import PioDevice
 
 class Uart(PioDevice):
     type = 'Uart'
+    abstract = True
     console = Param.SimConsole(Parent.any, "The console")
     size = Param.Addr(0x8, "Device size")
+
+class Uart8250(Uart):
+    type = 'Uart8250'
+
+class Uart8530(Uart):
+    type = 'Uart8530'
+