meta-zaius: Move refclock-fixup enablement

Make refclock-fixup a runtime dependency to pdbg-based host control.
Remove refclock-fixup's direct dependency to image.

Signed-off-by: Xo Wang <xow@google.com>
Change-Id: I2ba73d43f6e9dcaac50fe8256ff0aa210cdf40f2
diff --git a/meta-zaius/recipes-phosphor/host/p9-host-start.bbappend b/meta-zaius/recipes-phosphor/host/p9-host-start.bbappend
new file mode 100644
index 0000000..d0bda84
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/host/p9-host-start.bbappend
@@ -0,0 +1 @@
+RDEPENDS_${PN} += 'refclock-fixup'