openpower-proc-control: Add new service file for setting the SPI mux

This service file is only necessary with phal-type systems, so only
install it there.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Change-Id: Ie557031743170d9e55939badff4f7e3ed58706f4
diff --git a/recipes-phosphor/host/op-proc-control_git.bb b/recipes-phosphor/host/op-proc-control_git.bb
index 9f17aa2..01ef6b0 100644
--- a/recipes-phosphor/host/op-proc-control_git.bb
+++ b/recipes-phosphor/host/op-proc-control_git.bb
@@ -33,4 +33,5 @@
                          xyz.openbmc_project.Control.Host.NMI.service \
                          op-stop-instructions@.service \
                          op-cfam-reset.service \
+                         ${@bb.utils.contains('OBMC_MACHINE_FEATURES', 'phal', 'set-spi-mux.service', '', d)} \
                          "