dev-arm: Add RealView support for initrd/initramfs
dev-arm: Add RealView support for initrd/initramfs

Update the RealView bootloader simulator to set up the initrd_addr. The
load address is derived from the dtb_addr plus the maximum allowable DTB
blob size.

Change-Id: I2eaeb1ade38d24ad8e02230cc99d12873c2f56f9
Signed-off-by: Alistair Delva <23ee790dfac9f550e53930edf0f667e54338af85@google.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54185
Reviewed-by: Richard Cooper <5451b9f082a6f419264dc2e8898d5200257ca9ce@arm.com>
Maintainer: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5