skiboot: missing defconfig updates from 898245e.

The above referenced commit made changes to Config.in for the
skiboot package but did not replicate these to all supported
machines.  Fix barreleye, garrison, and openpower_mambo.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/openpower/configs/barreleye_defconfig b/openpower/configs/barreleye_defconfig
index b6cdb21..28e89bc 100644
--- a/openpower/configs/barreleye_defconfig
+++ b/openpower/configs/barreleye_defconfig
@@ -31,8 +31,8 @@
 BR2_OPENPOWER_PNOR_UPDATE_FILENAME="barreleye_update.pnor"
 
 # skiboot requirements
-BR2_TARGET_SKIBOOT=y
-BR2_TARGET_SKIBOOT_EMBED_PAYLOAD=n
+BR2_PACKAGE_SKIBOOT=y
+BR2_PACKAGE_SKIBOOT_EMBED_PAYLOAD=n
 
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y
diff --git a/openpower/configs/garrison_defconfig b/openpower/configs/garrison_defconfig
index 9cb67f8..3a8b789 100644
--- a/openpower/configs/garrison_defconfig
+++ b/openpower/configs/garrison_defconfig
@@ -31,8 +31,8 @@
 BR2_OPENPOWER_PNOR_UPDATE_FILENAME="garrison_update.pnor"
 
 # skiboot requirements
-BR2_TARGET_SKIBOOT=y
-BR2_TARGET_SKIBOOT_EMBED_PAYLOAD=n
+BR2_PACKAGE_SKIBOOT=y
+BR2_PACKAGE_SKIBOOT_EMBED_PAYLOAD=n
 
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y
diff --git a/openpower/configs/openpower_mambo_defconfig b/openpower/configs/openpower_mambo_defconfig
index 8a803d0..5422a08 100644
--- a/openpower/configs/openpower_mambo_defconfig
+++ b/openpower/configs/openpower_mambo_defconfig
@@ -19,8 +19,8 @@
 BR2_PACKAGE_OPENPOWER_PNOR=n
 
 # skiboot will be built but we don't need embedded payload
-BR2_TARGET_SKIBOOT=y
-BR2_TARGET_SKIBOOT_EMBED_PAYLOAD=n
+BR2_PACKAGE_SKIBOOT=y
+BR2_PACKAGE_SKIBOOT_EMBED_PAYLOAD=n
 
 # petitboot requirements
 BR2_ENABLE_LOCALE_PURGE=y