sparc/mm/: possible cleanups

sparc/mm/: possible cleanups

This patch contains the following possible cleanups:
- make the following needlessly global code static:
  - fault.c: force_user_fault()
  - init.c: calc_max_low_pfn()
  - init.c: pgt_cache_water[]
  - init.c: map_high_region()
  - srmmu.c: hwbug_bitmask
  - srmmu.c: srmmu_swapper_pg_dir
  - srmmu.c: srmmu_context_table
  - srmmu.c: is_hypersparc
  - srmmu.c: srmmu_cache_pagetables
  - srmmu.c: srmmu_nocache_size
  - srmmu.c: srmmu_nocache_end
  - srmmu.c: srmmu_get_nocache()
  - srmmu.c: srmmu_free_nocache()
  - srmmu.c: srmmu_early_allocate_ptable_skeleton()
  - srmmu.c: srmmu_nocache_calcsize()
  - srmmu.c: srmmu_nocache_init()
  - srmmu.c: srmmu_alloc_thread_info()
  - srmmu.c: early_pgtable_allocfail()
  - srmmu.c: srmmu_early_allocate_ptable_skeleton()
  - srmmu.c: srmmu_allocate_ptable_skeleton()
  - srmmu.c: srmmu_inherit_prom_mappings()
  - sunami.S: tsunami_copy_1page
- remove the following unused code:
  - init.c: struct sparc_aliases

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>