[BMP upload] Fix tools path

Fixes #986

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

platform.txt

@@ -171,11 +171,11 @@ tools.stm32CubeProg.upload.pattern="{path}/{cmd}" {upload.protocol} "{build.path
 
 # blackmagic upload for generic STM32
 tools.bmp_upload.cmd=arm-none-eabi-gdb
-tools.bmp_upload.path={runtime.tools.arm-none-eabi-gcc.path}/bin/
+tools.bmp_upload.path={runtime.tools.xpack-arm-none-eabi-gcc.path}/bin
 tools.bmp_upload.upload.speed=230400
 tools.bmp_upload.upload.params.verbose=-batch
 tools.bmp_upload.upload.params.quiet=--batch-silent
-tools.bmp_upload.upload.pattern="{path}{cmd}" -nx -b {upload.speed} {upload.verbose} -ex "set confirm off" -ex "target extended-remote {serial.port}" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -ex "compare-sections" -ex "kill" "{build.path}/{build.project_name}.elf"
+tools.bmp_upload.upload.pattern="{path}/{cmd}" -nx -b {upload.speed} {upload.verbose} -ex "set confirm off" -ex "target extended-remote {serial.port}" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -ex "compare-sections" -ex "kill" "{build.path}/{build.project_name}.elf"
 
 # HID flash 2.2 (HID bootloader v2.2 for STM32F1 and STM32F4 series)
 tools.hid_upload.cmd=hid-flash