libpayload: Use CONFIG_LP_CCACHE instead of CONFIG_CCACHE

CONFIG_CCACHE was obsoleted a long time ago for libpayload.

Change-Id: Ib0a418d97f368439476e524b753160a6229bb9f6
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10710
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/payloads/libpayload/Makefile.inc b/payloads/libpayload/Makefile.inc
index 873673c..c10718f 100644
--- a/payloads/libpayload/Makefile.inc
+++ b/payloads/libpayload/Makefile.inc
@@ -132,7 +132,7 @@
 		$(MAKE) clean; \
 		yes "" | $(MAKE) oldconfig DOTCONFIG=$$i V=$(V) Q=$(Q) 2>/dev/null >/dev/null; \
 		echo "<testcase classname='libpayload' name='$$i'>" >> $@.tmp; \
-		$(MAKE) V=$(V) Q=$(Q) CONFIG_CCACHE=$(CONFIG_CCACHE) DOTCONFIG=$$i >> $@.tmp.2 2>&1 && type="system-out" || type="failure"; \
+		$(MAKE) V=$(V) Q=$(Q) CONFIG_LP_CCACHE=$(CONFIG_LP_CCACHE) DOTCONFIG=$$i >> $@.tmp.2 2>&1 && type="system-out" || type="failure"; \
 		if [ $$type = "failure" ]; then \
 			echo "<failure type='buildFailed'>" >> $@.tmp; \
 		else \