arm64: use simpler API for random address requests

arm64: use simpler API for random address requests

Currently, all callers to randomize_range() set the length to 0 and
calculate end by adding a constant to the start address.  We can simplify
the API to remove a bunch of needless checks and variables.

Use the new randomize_addr(start, range) call to set the requested
address.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jason Cooper <[email protected]>
Acked-by: Will Deacon <[email protected]>
Acked-by: Kees Cook <[email protected]>
Cc: "Russell King - ARM Linux" <[email protected]>
Cc: Catalin Marinas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>