if an uImage is to be built for arm, avr32, blackfin and sh.
PATH has therefore been set to have $(STAGING_DIR)/usr/bin
as the first item allowing linux to find mkimage.
This patch will, if an uImage is built, create a "u-boot-toóls"
directory in the PROJECT_BUILD_DIR directory.
$(STAGING_DIR)/usr/bin/mkimage is copied to this directory
and the PATH variable will now include "u-boot-tools"
If an uImage is built, then the linux build will now depend on "u-boot".
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