[temp]: Fix Micas plat_sysfs parallel build race

The plat_sysfs/Makefile lists dev_cfg and dev_sysfs as prerequisites
of 'all' but declares no ordering between them. Under make -j
(SONiC uses -j12 by default) the two subdirs can build in parallel
and the modpost step in dev_sysfs fails with:

  dev_cfg/Module.symvers: No such file or directory

because dev_sysfs/Makefile's KBUILD_EXTRA_SYMBOLS references that
file. Adding 'dev_sysfs: dev_cfg' forces dev_cfg to finish first.

Temporary patch on this branch so verification builds for the SBOM
work complete reliably. Drop this commit (git rebase --onto) once
an equivalent upstream fix lands.

Signed-off-by: Brad House <bhouse@nexthop.ai>

Author: bhouse-nexthop

platform/broadcom/sonic-platform-modules-micas/common/modules/plat_sysfs/Makefile

@@ -8,6 +8,13 @@ all : CHECK $(SUBDIRS)
 CHECK :
 	@echo $(pes_parent_dir)
 
+# dev_sysfs's modpost step reads dev_cfg/Module.symvers (see
+# dev_sysfs/Makefile's KBUILD_EXTRA_SYMBOLS). Without an explicit
+# ordering dependency, make -j can launch dev_sysfs in parallel with
+# dev_cfg and the modpost step fails with:
+#   dev_cfg/Module.symvers: No such file or directory
+dev_sysfs: dev_cfg
+
 $(SUBDIRS):ECHO
 	#@echo $@
 	make -C $@