system/nxdiag: Change the order to generate the sysinfo.h file

The generation of `sys info.h` depends on evaluating whether
Espressif's HAL exists in the arch folder. However, cloning the HAL
itself happens in the `context` phase of the build, so it is
necessary to wait for it to finish before proceeding to the
evaluation in nxdiag. This is done by using the `depend` phase to
generate the `sysinfo.h` file.

system/nxdiag/Makefile

@@ -113,7 +113,7 @@ sysinfo.h : checkpython3 $(INFO_DEPS)
 		exit 1; \
 	fi
 
-context:: sysinfo.h
+depend:: sysinfo.h
 
 distclean::
 	$(call DELFILE, sysinfo.h)