[PATCH] uml: Eliminate unusable function

Eliminate the non-inline version of switch_mm, which can't be used,
considering the inline version in asm/mmu_context.h

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>