meta-phosphor: image-signing: set LICENSE field

Set LICENSE field explicitly.

Change-Id: I41774c32d0af36bea16fdcc4c4e56596267e080b
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/flash/phosphor-image-signing.bb b/recipes-phosphor/flash/phosphor-image-signing.bb
index 897bfde..bce9853 100644
--- a/recipes-phosphor/flash/phosphor-image-signing.bb
+++ b/recipes-phosphor/flash/phosphor-image-signing.bb
@@ -1,9 +1,10 @@
 SUMMARY = "OpenBMC image signing public key"
 DESCRIPTION = "Public key information to be included in images for image verification."
 PR = "r1"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${PHOSPHORBASE}/COPYING.apache-2.0;md5=34400b68072d710fecd0a2940a0d1658"
 
 inherit allarch
-inherit obmc-phosphor-license
 
 INSECURE_KEY = "${@'${SIGNING_KEY}' == '${STAGING_DIR_NATIVE}${datadir}/OpenBMC.priv'}"