meta-intel: add intel suffix to recipes

Add a suffix, "intel" to all common intel recipe changes.  The suffix is
defined in intel.inc, which is included already in the s2600wf machine
conf and likely any platform including meta-intel.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I8113e8eb494548f5f8fff9888a9ad2e1a086a942
diff --git a/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend b/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
index 4be8ddb..3e769e1 100644
--- a/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
+++ b/meta-common/recipes-phosphor/sel-logger/phosphor-sel-logger_%.bbappend
@@ -1,2 +1,2 @@
 # Enable threshold monitoring
-EXTRA_OECMAKE += "-DSEL_LOGGER_MONITOR_THRESHOLD_EVENTS=ON"
+EXTRA_OECMAKE_intel += "-DSEL_LOGGER_MONITOR_THRESHOLD_EVENTS=ON"