meta-facebook: add BMC compatible strings for all platforms

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Idedb1dd9459b649cacbbb31284e137cc3f52327c
diff --git a/meta-facebook/meta-bletchley/conf/machine/bletchley.conf b/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
index 85da2a3..4890497 100644
--- a/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
+++ b/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
@@ -6,6 +6,8 @@
 SPL_BINARY = "spl/u-boot-spl.bin"
 SOCSEC_SIGN_ENABLE = "0"
 
+OBMC_COMPATIBLE_NAMES = "com.meta.Hardware.BMC.Model.Bletchley"
+
 require conf/distro/include/phosphor-static-norootfs.inc
 require conf/machine/include/facebook-nohost.inc
 require conf/machine/include/ast2600.inc