Merge branch 'sparc32-NO_BOOTMEM'

Mike Rapoport says:

====================
sparc32: switch to NO_BOOTMEM

These patches convert sparc32 to use memblock + nobootmem.
I've made the conversion as simple as possible, just enough to allow moving
HAVE_MEMBLOCK and NO_BOOTMEM to the common SPARC configuration.

v2 changes:
* split whitespace changes to a separate patch
* address Sam's comments [1]

[1] https://lkml.org/lkml/2018/8/2/403
====================

Signed-off-by: David S. Miller <davem@davemloft.net>