Add phosphor-mapper as a dependency to bmcweb

When IPMI is removed from the build (like happens in QEMU images) the
mapper gets removed as well.  bmcweb relies on phosphor-mapper, so add
an RDEPEND to that effect to make sure it gets installed properly.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I699c62225c9862c91a9d670b8c170e32f03e787d
diff --git a/meta-phosphor/recipes-phosphor/interfaces/bmcweb_git.bb b/meta-phosphor/recipes-phosphor/interfaces/bmcweb_git.bb
index b209b28..c5c5037 100644
--- a/meta-phosphor/recipes-phosphor/interfaces/bmcweb_git.bb
+++ b/meta-phosphor/recipes-phosphor/interfaces/bmcweb_git.bb
@@ -31,6 +31,7 @@
 
 RDEPENDS_${PN} += " \
     jsnbd \
+    phosphor-mapper \
 "
 
 FILES_${PN} += "${datadir}/** "