meta-facebook: harma: revise led period

Revise the LED period to fit the hardware specification:
0.5 seconds on, 0.5 seconds off.

Change-Id: I5cc9f7fed4ddd0663a3970b1d87f0a7a581e510f
Signed-off-by: Peter Yin <peter.yin@quantatw.com>
diff --git a/meta-facebook/meta-harma/recipes-phosphor/leds/phosphor-led-manager/led-group-config.json b/meta-facebook/meta-harma/recipes-phosphor/leds/phosphor-led-manager/led-group-config.json
index 00e2293..f4aa51e 100644
--- a/meta-facebook/meta-harma/recipes-phosphor/leds/phosphor-led-manager/led-group-config.json
+++ b/meta-facebook/meta-harma/recipes-phosphor/leds/phosphor-led-manager/led-group-config.json
@@ -28,7 +28,7 @@
                     "Name": "fp_id_amber",
                     "Action": "Blink",
                     "DutyOn": 50,
-                    "Period": 250
+                    "Period": 1000
                 }
             ]
         }