Compile HCODE using optimal number of cores

Removes the HCODE compile directive which limits HCODE compile to 2 cores.
diff --git a/openpower/package/hcode-p10/hcode-p10.mk b/openpower/package/hcode-p10/hcode-p10.mk
index 016202a..2dfd59e 100644
--- a/openpower/package/hcode-p10/hcode-p10.mk
+++ b/openpower/package/hcode-p10/hcode-p10.mk
@@ -49,7 +49,7 @@
 endef
 
 define HCODE_P10_BUILD_CMDS
-	$(HCODE_P10_ENV_VARS) bash -c 'cd $(@D) && source ./env.bash && $(MAKE) -j 2 '
+	$(HCODE_P10_ENV_VARS) bash -c 'cd $(@D) && source ./env.bash && $(MAKE) '
 endef
 
 $(eval $(generic-package))