board: rpi: Enable capsule updates

Since RPI works well using EFI and has no size limitations with regards
to U-Boot, add the needed structures to support capsule updates.

While at it update the most commonly used defconfigs and include capsule
support and U-Boot commands needed by EFI

Tested-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
5 files changed