tcl/target: Move nordic configuration files

Move target configuration files into a dedicated vendor directory as
required by the new guideline for configuration files.

Note that the moved files are still accessible via the old path to ensure
backwards compatibility. This works because of the extended file search in
vendor folders.

Change-Id: If3935985769dc543e8c7d72cda590c9d79303abb
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/8905
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

tcl/target/nordic/nrf53.cfg

@@ -60,7 +60,7 @@ if { ![using_hla] } {
 # Keep adapter speed less or equal 2000 kHz or flash programming fails!
 adapter speed 1000
 
-source [find target/nrf_common.cfg]
+source [find target/nordic/common.cfg]
 
 flash bank $_CHIPNAME.app.flash nrf5 0x00000000 0 0 0 $_TARGETNAME_APP
 flash bank $_CHIPNAME.app.uicr nrf5 0x00FF8000 0 0 0 $_TARGETNAME_APP

tcl/target/nordic/nrf91.cfg

@@ -45,7 +45,7 @@ adapter speed 1000
 
 $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
 
-source [find target/nrf_common.cfg]
+source [find target/nordic/common.cfg]
 
 flash bank $_CHIPNAME.flash nrf5 0x00000000 0 0 0 $_TARGETNAME
 flash bank $_CHIPNAME.uicr nrf5 0x00FF8000 0 0 0 $_TARGETNAME