netipmid: Make pam_auth configurable

Allow people to disable pam_authenticate if it is not working for their
system.

Tested:
Testing on a system with no dropbear and was able to pass the check.

Change-Id: I932830cd518b7f8ef6c828405b4959a8d14b1b58
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/meson_options.txt b/meson_options.txt
index 097dc52..bad5e62 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -11,3 +11,10 @@
     value: 'enabled',
     description : 'Enable RMCP Ping support'
 )
+
+option(
+    'pam_authenticate',
+    type : 'feature',
+    value: 'enabled',
+    description : 'Enable Pam Authenticate'
+)