u-boot: drop backported patches
U-boot has been updated to 2017.01 in poky/oe-core which contains these
patches.
-FILESEXTRAPATHS_prepend_rpi := "${THISDIR}/files:"
RDEPENDS_${PN}_append_rpi = " rpi-u-boot-scr"
-SRC_URI_append_rpi = " \
- file://0001-arm-add-save_boot_params-for-ARM1176.patch \
- file://0002-rpi-passthrough-of-the-firmware-provided-FDT-blob.patch \
- "
