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.

(From meta-phosphor rev: c9708901440892ea45a18d4d09a4d6a9a182de90)

Change-Id: Id5462e63da6b063181a839e16e02c98351feea0f
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/recipes-phosphor/configuration/entity-manager_git.bb b/meta-phosphor/recipes-phosphor/configuration/entity-manager_git.bb
index 25cd24a..8660db7 100644
--- a/meta-phosphor/recipes-phosphor/configuration/entity-manager_git.bb
+++ b/meta-phosphor/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