omnia-uboot: take changes from develop branch

hardware/omnia/omnia-uboot/Makefile

 #
-## Copyright (C) 2018-2020 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+## Copyright (C) 2018-2022 CZ.NIC z.s.p.o. (http://www.nic.cz/)
 #
 ## This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=omnia-uboot
-PKG_VERSION:=2019-07.1
+PKG_VERSION:=2022.04
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=https://gitlab.nic.cz/turris/turris-omnia-uboot.git
-PKG_MIRROR_HASH:=aeab20bcc0f36f57ca95fb4bc093d49e39c04fe50ab88bcd8ee280739acacea7
-PKG_SOURCE_DATE:=2020-09-07
-PKG_SOURCE_VERSION:=6dd804d78fdcd775f6eeebe0aa0527d6761a115f
+PKG_SOURCE_URL:=https://source.denx.de/u-boot/u-boot.git
+PKG_MIRROR_HASH:=5a1ca6d5056822b7d1fd9c84ef65f5456278f5ac2eef74025fce66e056301fa8
+PKG_SOURCE_DATE:=2022-04-04
+PKG_SOURCE_VERSION:=v$(PKG_VERSION)
 
 PKG_MAINTAINER:=CZ.NIC <packaging@turris.cz>
 PKG_LICENSE:=GPL-2.0-or-later
@@ -30,9 +30,8 @@ define Package/omnia-uboot
 endef
 
 define Build/Compile
-	sed -i '/DCONFIG_KWB_SECURE/ d' $(PKG_BUILD_DIR)/tools/Makefile
 	cd $(PKG_BUILD_DIR); make CROSS_COMPILE=$(TARGET_CROSS) turris_omnia_defconfig
-	cd $(PKG_BUILD_DIR); make CROSS_COMPILE=$(TARGET_CROSS) u-boot-spl.kwb OMNIA_OLD_SPL=1
+	cd $(PKG_BUILD_DIR); make CROSS_COMPILE=$(TARGET_CROSS) u-boot-spl.kwb
 endef
 
 define Package/omnia-uboot/install