meta-ibm: witherspoon: gpio-monitor: set version wildcard

Set the wildcard for version for phosphor-gpio-monitor.bbappend.

Change-Id: Iad45c6f721fcd5e5afcf0b726abc33a839af0337
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend b/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend
new file mode 120000
index 0000000..02a53b4
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/gpio/phosphor-gpio-monitor_%.bbappend
@@ -0,0 +1 @@
+phosphor-gpio-monitor.bbappend
\ No newline at end of file