MEN-4395: Bump mender-rpi-uboot to 2020.01

Changelog: The standard RasperryPi configuration now comes with UBoot 2020.01 as
the default.
Signed-off-by: Ole Petter <ole.orhagen@northern.tech>

configs/raspberrypi_config

@@ -10,7 +10,7 @@ MENDER_COPY_BOOT_GAP=n
 # 4MB alignment
 MENDER_PARTITION_ALIGNMENT="4194304"
 
-RASPBERRYPI_BINARIES="${RASPBERRYPI_CONFIG}-2019.01.tar.gz"
+RASPBERRYPI_BINARIES="${RASPBERRYPI_CONFIG}-2020.01.tar.gz"
 RASPBERRYPI_BINARIES_URL="${MENDER_STORAGE_URL}/mender-convert/uboot/raspberrypi/${RASPBERRYPI_BINARIES}"
 
 function platform_modify() {