tool/frofs: Do not change order of elements in L1 hash table

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
tool/frofs: Round element count to power of two

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
kernel/frofs: Add O(1) lookup implementation

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>