Add recipes for Witherspoon VCS workaround

Create vcs-workaround machine feature p9.inc
Add new recipe vcs-pre-post.bb
Add new recipe p9-vcs-workaround.bb
Add new recipe start_host.bb
Create preferred providers
Create host control machine/distro/image feature
Add dependencies

Partially resolves openbmc/openbmc#647

Change-Id: I285cafc81afda20977fdf360ad8ad34d15e38685
Signed-off-by: Sergey Solomin <sergey.solomin@us.ibm.com>
diff --git a/meta-openbmc-machines/meta-openpower/conf/machine/include/p9.inc b/meta-openbmc-machines/meta-openpower/conf/machine/include/p9.inc
new file mode 100644
index 0000000..936576d
--- /dev/null
+++ b/meta-openbmc-machines/meta-openpower/conf/machine/include/p9.inc
@@ -0,0 +1,2 @@
+OBMC_MACHINE_FEATURES += 'p9-vcs-workaround'
+PREFERRED_PROVIDER_virtual/obmc-host-ctl = "p9-host-start"