meta-ibm: Remove references to IBMBASE

IBMBASE is only used for pointing at licenses...point at the
licenses in oe-core in meta/files/common-licenses instead. to match the
defacto convention used in other oe layers like meta-openembedded.

(From meta-ibm rev: cbbb0e5b4e44d831fce5daafd13272d401440f40)

Change-Id: Ib214f92b2c384e3eb2a1f53ecf4b21034438d001
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button.bb b/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button.bb
index cdbdf77..386a2b9 100644
--- a/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button.bb
+++ b/meta-ibm/meta-witherspoon/recipes-phosphor/gpio/id-button.bb
@@ -1,7 +1,7 @@
 SUMMARY = "ID Button pressed application"
 PR = "r1"
 LICENSE = "Apache-2.0"
-LIC_FILES_CHKSUM = "file://${IBMBASE}/COPYING.apache-2.0;md5=34400b68072d710fecd0a2940a0d1658"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
 
 inherit obmc-phosphor-systemd