arch: Make ARCH_STACKWALK independent of STACKTRACE

arch: Make ARCH_STACKWALK independent of STACKTRACE

Make arch_stack_walk() available for ARCH_STACKWALK architectures
without it being entangled in STACKTRACE.

Link: https://lore.kernel.org/lkml/[email protected]/
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
[Mark: rebase, drop unnecessary arm change]
Signed-off-by: Mark Rutland <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>