add ofw api to of net,driver writer can use this api get phy modes or get mac address

components/drivers/phy/SConscript

@@ -2,7 +2,9 @@ from building import *
 
 cwd     = GetCurrentDir()
 src = Glob('*.c')
-CPPPATH = [cwd + '/../include']
+if GetDepend('RT_USING_OFW') == False:
+    SrcRemove(src, ['ofw.c'])
+CPPPATH = [cwd,cwd + '/../include']
 group = DefineGroup('DeviceDrivers', src, depend = ['RT_USING_PHY'], CPPPATH = CPPPATH)
 
 Return('group')

components/net/ofw/SConscript

@@ -1,10 +0,0 @@
-from building import *
-
-cwd = GetCurrentDir()
-src = Glob('*.c')
-
-CPPPATH = [cwd]
-
-group = DefineGroup('ofw', src, depend = ['RT_USING_OFW'], CPPPATH = CPPPATH)
-
-Return('group')