Use raspberrypi-firmware-uefi for Raspberry Pi

This PR switches from the standard firmware to "system ready" (UEFI)
firmware for Raspberry Pi

Signed-off-by: Klaus Kämpf <kkaempf@suse.de>

.obs/dockerfile/slem4r-os/Dockerfile

@@ -44,7 +44,7 @@ RUN zypper --installroot /osimage in --no-recommends -y squashfs NetworkManager
 
 # make ARM happy
 #!ArchExclusiveLine: aarch64
-RUN if [ `uname -m` = "aarch64" ]; then zypper --installroot /osimage in -y raspberrypi-firmware raspberrypi-firmware-config raspberrypi-firmware-dt u-boot-rpiarm64 grub2-arm64-efi; fi
+RUN if [ `uname -m` = "aarch64" ]; then zypper --installroot /osimage in -y raspberrypi-firmware-uefi grub2-arm64-efi; fi
 
 # make SUSE happy
 RUN zypper --installroot /osimage in --no-recommends -y SLE-Micro-Rancher-release systemd-presets-branding-SLE-Micro-for-Rancher