Automatically scale down the image padding size

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# How much KB we want to add to the calculated size for slack space

#GENEXT2_ADDTOROOTSIZE=4096

GENEXT2_ADDTOROOTSIZE=16384

GENEXT2_REALSIZE=$(subst total,, $(shell LANG=C du $(TARGET_DIR) -s -c -k | grep total ))

GENEXT2_ADDTOROOTSIZE=$(shell if [ $(GENEXT2_REALSIZE) -ge 20000 ] ; then echo 16384; else echo 16; fi)

GENEXT2_SIZE=$(shell expr $(GENEXT2_REALSIZE) + $(GENEXT2_ADDTOROOTSIZE))

# We currently add about 400 device nodes, so add that into the total

GENEXT2_INODES=$(shell expr $(shell find $(TARGET_DIR) | wc -l) + 400)