running code causes board to fail in an unrecoverable manner

change to using the olimex-arm-usb-tiny and adjust openocd
srst settings so the failure is now recoverable

openocd/zc706.cfg

@@ -1,4 +1,4 @@
-source ./digilent_jtag_smt2_nc.cfg
+source [find interface/ftdi/olimex-arm-usb-tiny-h.cfg]
 adapter_khz 1000
 
 set PL_TAPID 0x23731093
@@ -8,7 +8,9 @@ source ./zynq-7000.cfg
 source ./xilinx-tcl.cfg
 source ./ps7_init.tcl
 
-reset_config srst_only srst_push_pull
+reset_config srst_only srst_open_drain
+adapter_nsrst_assert_width 250
+adapter_nsrst_delay 400
 
 set XC7_JSHUTDOWN 0x0d
 set XC7_JPROGRAM 0x0b