mm: expose arch_mmap_rnd when available

When an architecture fully supports randomizing the ELF load location,
a per-arch mmap_rnd() function is used to find a randomized mmap base.
In preparation for randomizing the location of ET_DYN binaries
separately from mmap, this renames and exports these functions as
arch_mmap_rnd(). Additionally introduces CONFIG_ARCH_HAS_ELF_RANDOMIZE
for describing this feature on architectures that support it
(which is a superset of ARCH_BINFMT_ELF_RANDOMIZE_PIE, since s390
already supports a separated ET_DYN ASLR from mmap ASLR without the
ARCH_BINFMT_ELF_RANDOMIZE_PIE logic).

Signed-off-by: Kees Cook <[email protected]>
Cc: Hector Marco-Gisbert <[email protected]>
Cc: Russell King <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "David A. Long" <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Arun Chandran <[email protected]>
Cc: Yann Droneaud <[email protected]>
Cc: Min-Hua Chen <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: Alex Smith <[email protected]>
Cc: Markos Chandras <[email protected]>
Cc: Vineeth Vijayan <[email protected]>
Cc: Jeff Bailey <[email protected]>
Cc: Michael Holzheu <[email protected]>
Cc: Ben Hutchings <[email protected]>
Cc: Behan Webster <[email protected]>
Cc: Ismael Ripoll <[email protected]>
Cc: Jan-Simon Mller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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