meta-bletchley: Add services to control step motor

For Bletchley platform, we can only power on system by step motor to press power key.
Add tools and service to initialize step motor and control system power
by motor.

Signed-off-by: Allen.Wang <Allen_Wang@quantatw.com>
Change-Id: Ic75352a037566d701b2e362743c527c370b0c2e5
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meta-facebook/meta-bletchley/conf/machine/bletchley.conf b/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
index d69357b..6b7711a 100644
--- a/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
+++ b/meta-facebook/meta-bletchley/conf/machine/bletchley.conf
@@ -13,3 +13,6 @@
 FLASH_SIZE = "131072"
 
 PREFERRED_PROVIDER_virtual/phosphor-led-manager-config-native = "bletchley-led-manager-config-native"
+
+OBMC_HOST_INSTANCES = "0 1 2 3 4 5 "
+