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/mcb1700.cfg

@@ -11,7 +11,7 @@ set MCB1700_CCLK $CCLK
 $_TARGETNAME configure -event reset-start {
 	# Start *real slow* as we do not know the
     # state the boot rom left the clock in
-	adapter_khz 10
+	adapter speed 10
 }
 
 # Set up 100MHz clock to CPU
@@ -55,7 +55,7 @@ $_TARGETNAME configure -event reset-init {
 	#
 	# 
 	global MCB1700_CCLK
-	adapter_khz [expr $MCB1700_CCLK / 8]
+	adapter speed [expr $MCB1700_CCLK / 8]
 
 	# Do not remap 0x0000-0x0020 to anything but the flash (i.e. select
 	# "User Flash Mode" where interrupt vectors are _not_ remapped,