Pass driver names to gpio-presence service

New code in phosphor-gpio-presence has the ability to
bind and unbind device drivers around card adds and
removes if necessary.

This commit passes in this driver information for the
power supplies.

Resolves openbmc/openbmc#2205

Change-Id: I7190219d549dc65cbb5498896b511a80a897aa8d
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/common/recipes-phosphor/gpio/phosphor-gpio-monitor/phosphor-gpio-presence@.service b/common/recipes-phosphor/gpio/phosphor-gpio-monitor/phosphor-gpio-presence@.service
index 758a21f..df75824 100644
--- a/common/recipes-phosphor/gpio/phosphor-gpio-monitor/phosphor-gpio-presence@.service
+++ b/common/recipes-phosphor/gpio/phosphor-gpio-monitor/phosphor-gpio-presence@.service
@@ -6,7 +6,7 @@
 
 [Service]
 EnvironmentFile={envfiledir}/obmc/gpio/phosphor-power-supply-%i.conf
-ExecStart=/usr/bin/env phosphor-gpio-presence --path=${{DEVPATH}} --inventory=${{INVENTORY}} --key=${{KEY}} --name=${{NAME}}
+ExecStart=/usr/bin/env phosphor-gpio-presence --path=${{DEVPATH}} --inventory=${{INVENTORY}} --key=${{KEY}} --name=${{NAME}} --drivers=${{DRIVERS}}
 SyslogIdentifier=phosphor-gpio-presence
 
 [Install]