max31785-msl: Default not to install

Default not to install the max31785-msl script and provide autoconf and
meson options to install it. This is a tool used to check the revision
of the MAX31785 fan controller chip against a configuration defining
what the minimum ship level is required. Always installing this script
isn't necessary where a MAX31785 chip doesn't exist in a machine or
where the revision of it needs to be verified.

Tested:
    Built using autoconf where the max31785-msl script is only installed
when `--enable-max31785-msl` is given
    Build using meson where the max31785-msl script is only installed
when `-Denable-max31785-msl=true` is given

Change-Id: I563e30f093340ee035fd55c5fb0a10bef879ca12
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/meson_options.txt b/meson_options.txt
index 24fe700..ccf3f90 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -19,3 +19,9 @@
     'update-functional-on-fail',
     description: 'Update functional property on read failures.  Incompatible with negative-errno-on-fail.',
     type: 'boolean')
+option(
+    'enable-max31785-msl',
+    type: 'boolean',
+    value: false,
+    description: 'Include building and installing the MAX31785 chip\'s minimum ship level checking application.'
+)