Allow transports to override the selected target (hla configs unification)

This should allow to share common configs for both regular access and
high-level adapters.

Use the newly-added functionality in stlink and icdi drivers, amend
the configs accordingly.

Runtime-tested with a TI tm4c123g board.

Change-Id: Ibb88266a4ca25f06f6c073e916c963f017447bad
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
[gus@projectgus.com: context-specific deprecation warnings]
Signed-off-by: Angus Gratton <gus@projectgus.com>
[andrew.smirnov@gmail.com: additional nrf51.cfg mods]
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Tested-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Reviewed-on: http://openocd.zylin.com/1664
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

tcl/target/stm32_stlink.cfg

@@ -1,60 +1 @@
-#
-# stm32 stlink pseudo target
-#
-
-if { [info exists CHIPNAME] } {
-   set _CHIPNAME $CHIPNAME
-} else {
-   set _CHIPNAME stm32f1x
-}
-
-# Work-area is a space in RAM used for flash programming
-# By default use 4kB (as found on some STM32F100s)
-if { [info exists WORKAREASIZE] } {
-   set _WORKAREASIZE $WORKAREASIZE
-} else {
-   set _WORKAREASIZE 0x1000
-}
-
-if { [info exists CPUTAPID] } {
-   set _CPUTAPID $CPUTAPID
-} else {
-   # this is the SW-DP tap id not the jtag tap id
-   set _CPUTAPID 0x1ba01477
-}
-
-if { [info exists TRANSPORT] } {
-   set _TRANSPORT $TRANSPORT
-   if { $TRANSPORT == "hla_jtag" } {
-      if { [info exists CPUTAPID] == 0 } {
-         # jtag requires us to use the jtag tap id
-         set _CPUTAPID 0x3ba00477
-      }
-   }
-} else {
-   set _TRANSPORT hla_swd
-}
-
-# add deprecated transport name check
-if { $_TRANSPORT == "stlink_swd" } {
-	set _TRANSPORT "hla_swd"
-	echo "DEPRECATED! use 'hla_swd' transport not 'stlink_swd'"
-}
-
-if { $_TRANSPORT == "stlink_jtag" } {
-	set _TRANSPORT "hla_jtag"
-	echo "DEPRECATED! use 'hla_jtag' transport not 'stlink_jtag'"
-}
-# end deprecated checks
-
-#
-# possibles value are hla_swd or hla_jtag
-#
-transport select $_TRANSPORT
-
-hla newtap $_CHIPNAME cpu -expected-id $_CPUTAPID
-
-set _TARGETNAME $_CHIPNAME.cpu
-target create $_TARGETNAME hla_target -chain-position $_TARGETNAME
-
-$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
+echo "WARNING: stm32_stlink.cfg is deprecated (and does nothing, you can safely remove it.)"