qemu: arm64: Add documentation for capsule update
Add documentation highlighting the steps for using the uefi capsule
update feature for updating the u-boot firmware image.
Signed-off-by: 
Sughosh Ganu <sughosh.ganu@linaro.org>
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Add documentation highlighting the steps for using the uefi capsule
update feature for updating the u-boot firmware image.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>