Fix the anti-pattern in systemd service file

https://github.com/openbmc/docs/blob/master/anti-patterns.md#
use-of-usrbinenv-in-systemd-service-files

Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
Change-Id: I121bdebce7c88db450b28d6a1afd4e3e7cc30816
diff --git a/srvcfg-manager.service b/srvcfg-manager.service
index f75a028..391f39c 100644
--- a/srvcfg-manager.service
+++ b/srvcfg-manager.service
@@ -3,7 +3,7 @@
 
 [Service]
 Restart=always
-ExecStart=/usr/bin/env phosphor-srvcfg-manager
+ExecStart=/usr/bin/phosphor-srvcfg-manager
 RestartSec=5
 StartLimitInterval=0
 SyslogIdentifier=srvcfg-manager