Convert CONFIG_SYS_HZ to Kconfig

arch/arm/include/asm/arch-stv0991/stv0991_gpt.h

include/configs/MCR3000.h

include/configs/amcore.h

include/configs/ap121.h

include/configs/ap143.h

include/configs/ap152.h

include/configs/ci20.h

include/configs/cl-som-imx7.h

include/configs/colibri_imx7.h

include/configs/colibri_vf.h

include/configs/dart_6ul.h

include/configs/display5.h

include/configs/gazerbeam.h

include/configs/imx6-engicam.h

include/configs/imx6dl-mamoj.h

include/configs/imx7-cm.h

include/configs/kontron-sl-mx6ul.h

include/configs/kontron-sl-mx8mm.h

include/configs/liteboard.h

include/configs/ls1012a_common.h