arm-bsp/external-system: remove -fcanon-prefix-map from DEBUG_PREFIX_MAP

This recipe uses the binary Arm compiler, which is based on GCC 12.
Remove this GCC 13-specific option until the next release.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-bsp/recipes-bsp/external-system/external-system_0.1.0.bb

@@ -21,6 +21,9 @@ PRODUCT = "corstone-1000"
 S = "${WORKDIR}/git"
 B = "${WORKDIR}/build"
 
+# remove once arm-none-eabi-gcc updates to 13 or newer like poky
+DEBUG_PREFIX_MAP:remove = "-fcanon-prefix-map"
+
 LDFLAGS[unexport] = "1"
 
 do_compile() {