[Device Drivers] Remove backup mtd code

components/drivers/mtd/SConscript

@@ -1,5 +1,3 @@
-Import('RTT_ROOT')
-Import('rtconfig')
 from building import *
 
 cwd = GetCurrentDir()
@@ -9,17 +7,6 @@ depend = []
 CPPPATH = [cwd + '/../include']
 group = []
 
-if GetDepend(['RT_USING_MTD']):
-    src += ['mtd.c']
-    depend += ['RT_USING_MTD']
-
-    if GetDepend(['MTD_USING_NOR']):
-        src += ['mtdnor.c']
-        depend += ['MTD_USING_NOR']
-    if GetDepend(['MTD_USING_NAND']):
-        src += ['mtdnand.c']
-        depend += ['MTD_USING_NAND']
-
 if GetDepend(['RT_USING_MTD_NOR']):
     src += ['mtd_nor.c']
     depend += ['RT_USING_MTD_NOR']