Retry BS->ExitBootServices() if it fails, like on amd64. Also we need

to make sure to pass the current mapkey to prove EFI that we know the
current memory map and its constraints.  Otherwise EFI can choose to
only partially exit until we pass the correct key.  As we already use
the memory map to allocate memory for the kernel, split the previous
function into one simply retrieving the table and another one who uses
the map to allocate memory.  At some point it would be nice to actually
pass the table to the kernel since its data is more reliable than the
FDT only.  While there, sync a bit of style with the amd64 version.

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