build: use allowed over enabled

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`.

Change-Id: I794c658531483266bfce6f9b28127a166ed01490
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/libpldmresponder/meson.build b/libpldmresponder/meson.build
index 7de2cf2..f949db9 100644
--- a/libpldmresponder/meson.build
+++ b/libpldmresponder/meson.build
@@ -32,7 +32,7 @@
 
 responder_headers = ['.']
 
-if get_option('oem-ibm').enabled()
+if get_option('oem-ibm').allowed()
    responder_headers += [
     '../oem/ibm/',
    ]
@@ -66,7 +66,7 @@
   include_directories:include_directories(responder_headers),
   link_with: libpldmresponder)
 
-if get_option('tests').enabled()
+if get_option('tests').allowed()
   subdir('test')
 endif
 
diff --git a/libpldmresponder/test/meson.build b/libpldmresponder/test/meson.build
index 73938b4..8c9a845 100644
--- a/libpldmresponder/test/meson.build
+++ b/libpldmresponder/test/meson.build
@@ -14,7 +14,7 @@
 ]
 
 
-if get_option('oem-ibm').enabled()
+if get_option('oem-ibm').allowed()
   tests += [
     '../../oem/ibm/test/libpldmresponder_fileio_test',
     '../../oem/ibm/test/libpldmresponder_oem_platform_test'
@@ -26,7 +26,7 @@
                      implicit_include_directories: false,
                      include_directories: [ '../../requester', '../../pldmd' ],
                      link_args: dynamic_linker,
-                     build_rpath: get_option('oe-sdk').enabled() ? rpath : '',
+                     build_rpath: get_option('oe-sdk').allowed() ? rpath : '',
                      dependencies: [
                          libpldm_dep,
                          libpldmresponder_dep,