tcl: target: imx5{1,3}: remove bogus tapenable command

This seems to be a leftover from borrowing from omap3* configs. Since
SJC is not enabling or disabling the DAP tap, and the tap is always
available, the extra tapenable command causes warnings on startup
(can't enable what's already enabled).

Change-Id: I7514436d565aa5b91876dbdab547956f36dcab77
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/3892
Tested-by: jenkins

tcl/target/imx51.cfg

@@ -36,9 +36,6 @@ target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.DAP
 # some TCK tycles are required to activate the DEBUG power domain
 jtag configure $_CHIPNAME.SJC -event post-reset "runtest 100"
 
-# have the DAP "always" be active
-jtag configure $_CHIPNAME.SJC -event setup "jtag tapenable $_CHIPNAME.DAP"
-
 proc imx51_dbginit {target} {
      # General Cortex-A8 debug initialisation
      cortex_a dbginit

tcl/target/imx53.cfg

@@ -36,9 +36,6 @@ target create $_TARGETNAME cortex_a -chain-position $_CHIPNAME.DAP
 # some TCK tycles are required to activate the DEBUG power domain
 jtag configure $_CHIPNAME.SJC -event post-reset "runtest 100"
 
-# have the DAP "always" be active
-jtag configure $_CHIPNAME.SJC -event setup "jtag tapenable $_CHIPNAME.DAP"
-
 proc imx53_dbginit {target} {
      # General Cortex-A8 debug initialisation
      cortex_a dbginit