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We no longer need to call into the kernel to map the FDT before calling
into the kernel so let's drop the helpers we added for this.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-22-ardb@kernel.org

Signed-off-by: Will Deacon <will@kernel.org>