[bsp/rva8] cleanup drivers/SConscript

bsp/realview-a8/drivers/SConscript

@@ -6,15 +6,6 @@ from building import *
 cwd     = GetCurrentDir()
 src	= Glob('*.c')
 
-# remove no need file.
-if GetDepend('RT_USING_LWIP') == False:
-    src_need_remove = ['dm9000.c'] # need remove file list.
-    SrcRemove(src, src_need_remove)
-
-if GetDepend('RT_USING_DFS') == False:
-    src_need_remove = ['sd.c'] # need remove file list.
-    SrcRemove(src, src_need_remove)
-
 CPPPATH = [cwd]
 
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = CPPPATH)