meta-ibm: Use proper path names in service files

Don't use /usr/bin/env, it's an antipattern.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: If388f5427bb2ca45718d0ca99452bf3f147861dd
diff --git a/meta-ibm/recipes-phosphor/power/witherspoon-power-supply-sync/power-supply-sync.service b/meta-ibm/recipes-phosphor/power/witherspoon-power-supply-sync/power-supply-sync.service
index 9e34236..94dd45f 100644
--- a/meta-ibm/recipes-phosphor/power/witherspoon-power-supply-sync/power-supply-sync.service
+++ b/meta-ibm/recipes-phosphor/power/witherspoon-power-supply-sync/power-supply-sync.service
@@ -7,8 +7,7 @@
 ConditionPathExists=!/run/openbmc/chassis@0-on
 
 [Service]
-ExecStart=/usr/bin/env phosphor-gpio-util --gpio=105 --path=/dev/gpiochip0 --delay=5 --action=low_high
-SyslogIdentifier=power-supply-sync
+ExecStart=/usr/bin/phosphor-gpio-util --gpio=105 --path=/dev/gpiochip0 --delay=5 --action=low_high
 
 [Install]
 RequiredBy=obmc-chassis-poweron@0.target