meta-phosphor: led-manager: rename as git

Rename phosphor-led-manager.bb to phosphor-led-manager_git.bb per OE
norms.

Change-Id: Id0aadee2a00dd2653ae53287f5e2bcb28f3abf12
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/recipes-phosphor/leds/phosphor-led-manager.bb b/recipes-phosphor/leds/phosphor-led-manager_git.bb
similarity index 100%
rename from recipes-phosphor/leds/phosphor-led-manager.bb
rename to recipes-phosphor/leds/phosphor-led-manager_git.bb