Enable Witherspoon + Witherspoon_Dev configs

  - Use HOSTBOOT_STABLE for witherspoon config
  - Use HOSTBOOT_LATEST for witherspoon_dev config

Signed-off-by: Bill Hoffa <wghoffa@us.ibm.com>
diff --git a/openpower/package/hostboot/Config.in b/openpower/package/hostboot/Config.in
index 4ed609d..452e8a6 100644
--- a/openpower/package/hostboot/Config.in
+++ b/openpower/package/hostboot/Config.in
@@ -9,11 +9,14 @@
 
 choice
 	prompt "Hostboot version"
-	default BR2_HOSTBOOT_LATEST_VERSION
+	default BR2_HOSTBOOT_STABLE_VERSION
 
 config BR2_HOSTBOOT_LATEST_VERSION
 	bool "Use latest Hostboot master"
 
+config BR2_HOSTBOOT_STABLE_VERSION
+        bool "Use stable Hostboot version"
+
 config BR2_HOSTBOOT_CUSTOM_VERSION
 	bool "Custom version"
 
@@ -26,6 +29,7 @@
 config BR2_HOSTBOOT_VERSION
 	string
 	default "a3cf4f273a3ee1a2f91091f653eec7f4e8623c77" if BR2_HOSTBOOT_LATEST_VERSION
+        default "876b79aacd9b14f4c3561e954daa0285747c9662" if BR2_HOSTBOOT_STABLE_VERSION
 	default BR2_HOSTBOOT_CUSTOM_VERSION_VALUE \
 		if BR2_HOSTBOOT_CUSTOM_VERSION