Generate tach based presence detect YAML

Create gen_presence_yaml.pl to find the FRUs that use
tach readings as their presence detects, and create
the YAML definition necessary for mapping the tach
sensor readings to specific FRUs.

Change-Id: I3b3b1c4a32827b0efab2927353b0988880eaefa0
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/Build.PL b/Build.PL
index e62edfc..a69ee08 100644
--- a/Build.PL
+++ b/Build.PL
@@ -11,6 +11,7 @@
                      'gen_ipmi_sensor.pl',
                      'gen_led_groups.pl',
                      'gen_openpower_fru.pl',
+                     'gen_presence_yaml.pl',
                      'hwmon.pl'],
     pm_files => {'Inventory.pm' => 'lib/mrw/Inventory.pm',
                  'Util.pm' => 'lib/mrw/Util.pm'},