targets/*.conf cleanup: remove unnecessary TPUDRV_blob= lines MAIN_blob= and/or TPUDRV_blob= may be *optionally* defined in targets/*.conf files; if either variable is defined, it means that using the specified version of the blob library is allowed on this target, albeit likely suboptimal; if the variable is not defined, then using a blob is not an option and compilation from source is required for this component. MAIN_blob= and TPUDRV_blob= are now defaulted to empty in configure.sh, thus there is no need to explicitly specify that using a blob is not a valid option.

all:	romvecs-insert.lst

romvecs-insert.o:	romvecs-insert.S
	arm-elf-gcc -c $<

romvecs-insert.lst:	romvecs-insert.o
	arm-elf-objdump -d $< > $@

clean:
	rm -f romvecs-insert.o romvecs-insert.lst