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/board/icnova_imx53_sodimm.cfg

@@ -15,7 +15,7 @@ echo "i.MX53 SO-Dimm board lodaded."
 # Set reset type
 #reset_config srst_only
 
-adapter_khz 3000
+adapter speed 3000
 
 # Slow speed to be sure it will work
 jtag_rclk 1000
@@ -58,7 +58,7 @@ proc sodimm_init { } {
 	arm core_state arm
 
 	jtag_rclk 3000
-#	adapter_khz 3000
+#	adapter speed 3000
 }