Adhoc fixes in pfr-manager

1) Rename intel-pfr-manager to pfr-manger for syncing
   with recipe name.
2) Removed intel namespace for wider OEM's usage.
3) fix for anti-pattern in systemd service files.

Tested:
pfr-manager service works fine.

Change-Id: Ibeccf38116148dc2d270505d4197620330ab3330
Signed-off-by: AppaRao Puli <apparao.puli@linux.intel.com>
diff --git a/libpfr/inc/file.hpp b/libpfr/inc/file.hpp
index 6079eac..e817e7c 100644
--- a/libpfr/inc/file.hpp
+++ b/libpfr/inc/file.hpp
@@ -20,6 +20,7 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
+#include <unistd.h>
 
 #include <phosphor-logging/log.hpp>
 
@@ -31,8 +32,6 @@
 #include <linux/i2c-dev.h>
 }
 
-namespace intel
-{
 namespace pfr
 {
 
@@ -129,4 +128,3 @@
 };
 
 } // namespace pfr
-} // namespace intel