meta-phosphor: obmc-inventory: rename as git

obmc-inventory receives its source from mrw-rev.bbclass which is
git-based.

Change-Id: Ib5a4de26f21568cb64c73c723535d28c64b67aba
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/inventory/obmc-inventory.bb b/recipes-phosphor/inventory/obmc-inventory_git.bb
similarity index 100%
rename from recipes-phosphor/inventory/obmc-inventory.bb
rename to recipes-phosphor/inventory/obmc-inventory_git.bb