com.meta: add Bletchley15 BMC

As title, add Bletchkey15 which is a generational
upgrade of Bletchley (also called Bletchley 1.0).

Change-Id: I1844e331bca20dcbab9c61270dafd1aaf714be72
Signed-off-by: Amithash Prasad <amithash@meta.com>
diff --git a/yaml/com/meta/Hardware/BMC.interface.yaml b/yaml/com/meta/Hardware/BMC.interface.yaml
index 632ba25..cad723a 100644
--- a/yaml/com/meta/Hardware/BMC.interface.yaml
+++ b/yaml/com/meta/Hardware/BMC.interface.yaml
@@ -8,6 +8,7 @@
           Possible BMC types used for compatible strings.
       values:
           - name: Bletchley
+          - name: Bletchley15
           - name: Catalina
           - name: Clemente
           - name: Harma