1.Add scons support

2.Add Kconfig file
3.Delete some unnecessary files and directories

bsp/smartfusion2/libraries/SConscript

@@ -0,0 +1,16 @@
+from building import *
+import rtconfig
+
+cwd     = GetCurrentDir()
+
+src	= [cwd + '/sys_config/sys_config.c']
+src += [cwd + '/mss_gpio/mss_gpio.c']
+src += [cwd + '/mss_uart/mss_uart.c']
+
+CPPPATH = [cwd+'/sys_config']
+CPPPATH += [cwd+'/mss_gpio']
+CPPPATH += [cwd+'/mss_uart']
+
+group = DefineGroup('Libraries', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')