build: use allowed over enabled or not-disabled

Meson feature options are typically in a tri-state of enabled, disabled,
or auto.  The enabled and disabled functions on an option (from
`get_option`) no longer return true for auto features.  Instead, the
expectation is to use `allowed()` which is true for both enabled and
auto.

Switch all uses of `enabled` to `allowed`.
Switch all uses of `not disabled` to `allowed`.

Change-Id: I18a2a8f7607bda00fc7ebc8855884fe5f55d9e7d
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meson.build b/meson.build
index 1c42caf..d9f410c 100644
--- a/meson.build
+++ b/meson.build
@@ -12,15 +12,15 @@
   ],
 )
 
-if (get_option('libpeci').enabled())
+if (get_option('libpeci').allowed())
   add_project_arguments('-DLIBPECI', language: 'cpp')
 endif
 
-if (get_option('crashdump').enabled())
+if (get_option('crashdump').allowed())
   add_project_arguments('-DCRASHDUMP', language: 'cpp')
 endif
 
-if (get_option('send-to-logger').enabled())
+if (get_option('send-to-logger').allowed())
   add_project_arguments('-DSEND_TO_LOGGING_SERVICE', language: 'cpp')
 endif
 
@@ -60,7 +60,7 @@
   phosphor_dbus_interfaces,
 ]
 
-if (get_option('libpeci').enabled())
+if (get_option('libpeci').allowed())
   peci = dependency('libpeci')
   deps += [
     peci,
diff --git a/tests/meson.build b/tests/meson.build
index 2cadb5c..1fce748 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -21,7 +21,7 @@
 
 unit_tests = []
 
-if get_option('tests').enabled()
+if get_option('tests').allowed()
     # generate the test executable
     foreach unit_test : unit_tests
         test(