Install hostboot-p10 using hostboot env vars

Invoke hostboot-p10 package install with hostboot env vars

 Signed-off-by: Nick Bofferding <bofferdn@us.ibm.com>
diff --git a/openpower/package/hostboot-p10/hostboot-p10.mk b/openpower/package/hostboot-p10/hostboot-p10.mk
index af7c88b..c8e49d8 100644
--- a/openpower/package/hostboot-p10/hostboot-p10.mk
+++ b/openpower/package/hostboot-p10/hostboot-p10.mk
@@ -31,7 +31,7 @@
 endef
 
 define HOSTBOOT_P10_INSTALL_IMAGES_CMDS
-        cd $(@D) && source ./env.bash && $(@D)/src/build/tools/hbDistribute --openpower $(STAGING_DIR)/hostboot_build_images/
+        cd $(@D) && $(HOSTBOOT_P10_ENV_VARS) source ./env.bash && $(@D)/src/build/tools/hbDistribute --openpower $(STAGING_DIR)/hostboot_build_images/
 endef
 
 $(eval $(generic-package))