poky: Set version/codename for 2.4/rocko

(From meta-yocto rev: eef92880a26a73f5539af54f19e7653aa6b226a9)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -1,7 +1,7 @@
 DISTRO = "poky"
 DISTRO_NAME = "Poky (Yocto Project Reference Distro)"
-DISTRO_VERSION = "2.3+snapshot-${DATE}"
-DISTRO_CODENAME = "master"
+DISTRO_VERSION = "2.4"
+DISTRO_CODENAME = "rockor"
 SDK_VENDOR = "-pokysdk"
 SDK_VERSION := "${@'${DISTRO_VERSION}'.replace('snapshot-${DATE}','snapshot')}"