kvmtool: Copy Linux' rbtree implementation

This is not really Linux specific, just a neat implementation
used by kvmtool, too.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by:

kvmtool: Copy Linux' rbtree implementation

This is not really Linux specific, just a neat implementation
used by kvmtool, too.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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