infinity: Fix disabling watchdog

- watchdog is timed out before disabling it by mbed startup
- old booloader disable watchdog while new(2015/01) doesn't

keyboard/infinity/tool/k20dx32_flash.cfg

@@ -2,6 +2,22 @@
 # Nemuisan's Special for MK20DN32VFT5,MK20DX32VFT5,MK10DN32VFT5,MK10DX32VFT5
 
 
+# 0.8.0 has no these procs
+proc using_jtag {} {
+        set _TRANSPORT [ transport select ]
+        expr { [ string first "jtag" $_TRANSPORT ] != -1 }
+}
+
+proc using_swd {} {
+        set _TRANSPORT [ transport select ]
+        expr { [ string first "swd" $_TRANSPORT ] != -1 }
+}
+
+proc using_hla {} {
+        set _TRANSPORT [ transport select ]
+        expr { [ string first "hla" $_TRANSPORT ] != -1 }
+}
+
 source [find target/swj-dp.tcl]
 
 if { [info exists CHIPNAME] } {
@@ -109,7 +125,6 @@ proc eraser {} {
 	shutdown
 }
 
-
 #debug_level 3
 # HLA doesn't have cortex_m commands 
 if {![using_hla]} {