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* osutil: rework TotalSystemMemory to TotalUsableMemory This commit renames total TotalSystemMemory to TotalUsableMemory and also changes the code to take the CmaTotal into account. This is the memory reserved by the "Contiguous Memory Allocator" and it is not usable for normal processes. This kind of memory is used e.g. by the framebuffer of the Raspberry Pi or by DSPs on certain boards. * secboot: use half the mem for KDF in AddRecoveryKey Instead of benchmarking the KDF parameters for the recovery key (which takes some time to run) we can also use defaults for the KDF parameters. The defaults suggested by Chris are "4 iterations" and half the usable memory. This commit implements the suggestions. * secboot: update KDF memory heuristic After discussing with Chris and Samuele we updated the KDF memory heuristic so that it takes more parameters in mind. It now considers the usable memory and substracts a hardcoded 384MB that is required to have a working system (a bit of a conservative estiamte) and then takes half of this for the KDF memory. * osutil,secboot: fix typos * secboot: add comment about minimum mem