add uboot-lantiq (based on a patch contributed by Lantiq)

package/uboot-lantiq/Makefile

package/uboot-lantiq/easy50712_DDR166M.conf

package/uboot-lantiq/files/board/infineon/easy50712/Makefile

...age/uboot-lantiq/files/board/infineon/easy50712/config.mk

package/uboot-lantiq/files/board/infineon/easy50712/danube.c

...boot-lantiq/files/board/infineon/easy50712/ddr_settings.h

...iles/board/infineon/easy50712/ddr_settings_PROMOSDDR400.h

...files/board/infineon/easy50712/ddr_settings_Samsung_166.h

...lantiq/files/board/infineon/easy50712/ddr_settings_e111.h

...lantiq/files/board/infineon/easy50712/ddr_settings_e166.h

...tiq/files/board/infineon/easy50712/ddr_settings_psc_166.h

...lantiq/files/board/infineon/easy50712/ddr_settings_r111.h

...lantiq/files/board/infineon/easy50712/ddr_settings_r166.h

...oot-lantiq/files/board/infineon/easy50712/lowlevel_init.S

...e/uboot-lantiq/files/board/infineon/easy50712/pmuenable.S

...ge/uboot-lantiq/files/board/infineon/easy50712/u-boot.lds

package/uboot-lantiq/files/cpu/mips/danube/Makefile

package/uboot-lantiq/files/cpu/mips/danube/clock.c

package/uboot-lantiq/files/cpu/mips/danube/ifx_cache.S

package/uboot-lantiq/files/drivers/net/ifx_etop.c