meta-phosphor: entity-manager: use meson build

Meson build is quickly becoming the de-facto standard build system for
OpenBMC applications.  Meson support was added to entity-manager
recently - use it when baking.  Performance is unaffected.

Change-Id: I3c396747b73c43a1d13417fa54fa1cfef8b94909
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/configuration/entity-manager_git.bb b/recipes-phosphor/configuration/entity-manager_git.bb
index 25cd24a..8660db7 100644
--- a/recipes-phosphor/configuration/entity-manager_git.bb
+++ b/recipes-phosphor/configuration/entity-manager_git.bb
@@ -19,7 +19,4 @@
            valijson"
 
 S = "${WORKDIR}/git/"
-inherit cmake systemd
-
-EXTRA_OECMAKE = "-DYOCTO=1"
-
+inherit meson systemd