tcl: replace the deprecated commands with "adapter ..."

Avoid annoying "deprecated" messages while running the scripts
distributed with OpenOCD code.
Change automatically created with commands
	sed -i 's/adapter_khz/adapter speed/g' $(find tcl/ -type f)
	sed -i 's/adapter_nsrst_delay/adapter srst delay/g' $(find tcl/ -type f)
	sed -i 's/adapter_nsrst_assert_width/adapter srst pulse_width/g' $(find tcl/ -type f)

Minor indentation issue fixed manually in
	tcl/board/at91sam9g20-ek.cfg
	tcl/target/at91sam9260_ext_RAM_ext_flash.cfg

Change-Id: I425fd56c0c88cd6b06124621306eeb89166dfe71
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5284
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>

tcl/target/atmega128.cfg

@@ -4,10 +4,10 @@
    set _ENDIAN little
 
 # jtag speed
-adapter_khz 4500
+adapter speed 4500
 
 reset_config srst_only
-adapter_nsrst_delay 100
+adapter srst delay 100
 
 #jtag scan chain
 if { [info exists CPUTAPID] } {
@@ -27,7 +27,7 @@ flash bank $_FLASHNAME avr 0 0 0 0 $_TARGETNAME
 
 #to use it, script will be like:
 #init
-#adapter_khz 4500
+#adapter speed 4500
 #reset init
 #verify_ircapture disable
 #