Makefile: rename all libraries to built-in.o

Makefile

arch/microblaze/cpu/u-boot.lds

board/LEOX/elpt860/u-boot.lds

board/actux1/u-boot.lds

board/actux2/u-boot.lds

board/actux3/u-boot.lds

board/davinci/da8xxevm/u-boot-spl-hawk.lds

board/dvlhost/u-boot.lds

board/esteem192e/u-boot.lds

board/freescale/m52277evb/u-boot.lds

board/freescale/m53017evb/u-boot.lds

board/freescale/mx31ads/u-boot.lds

board/genietv/u-boot.lds

board/hermes/u-boot.lds

board/matrix_vision/mvsmr/u-boot.lds

board/mvblue/u-boot.lds

board/rbc823/u-boot.lds

board/spd8xx/u-boot.lds

board/svm_sc8xx/u-boot.lds

board/ti/am335x/u-boot.lds