[nano 33 iot] add svd file

Author: umbynos

boards.txt

@@ -256,6 +256,7 @@ nano_33_iot.build.pid=0x8057
 nano_33_iot.bootloader.tool=openocd
 nano_33_iot.bootloader.tool.default=openocd
 nano_33_iot.bootloader.file=nano_33_iot/samd21_sam_ba_arduino_nano_33_iot.bin
+nano_33_iot.build.svd_file={runtime.platform.path}/svd/at91samd21g18.svd
 
 # Arduino MKR FOX 1200
 # --------------------

platform.txt

@@ -140,6 +140,7 @@ debug.server.openocd.scripts_dir={runtime.tools.openocd-0.10.0-arduino7.path}/sh
 build.openocdinterface=interface/{programmer.protocol}.cfg
 debug.server.openocd.scripts.0={build.openocdinterface}
 debug.server.openocd.scripts.1={runtime.platform.path}/variants/{build.variant}/{build.openocdscript}
+debug.svd_file={build.svd_file}
 
 # Upload/Debug tools
 # ------------------