barebox: remove now-redundant ccache handling

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/barebox/barebox.mk

@@ -52,8 +52,7 @@ else
 BAREBOX_ARCH = $(KERNEL_ARCH)
 endif
 
-BAREBOX_MAKE_FLAGS = ARCH=$(BAREBOX_ARCH) CROSS_COMPILE="$(CCACHE) \
-	$(TARGET_CROSS)"
+BAREBOX_MAKE_FLAGS = ARCH=$(BAREBOX_ARCH) CROSS_COMPILE="$(TARGET_CROSS)"
 BAREBOX_MAKE_ENV = $(TARGET_MAKE_ENV)
 
 ifeq ($(BR2_TARGET_BAREBOX_USE_DEFCONFIG),y)