asm-generic: Remove asm-generic arch_bprm_mm_init()

This is a follow-on to commit 62e88b1c00de 'mm: Make
arch_unmap()/bprm_mm_init() available to all architectures'

I removed the asm-generic version of arch_unmap() in that patch,
but missed arch_bprm_mm_init().  So this broke the build for
architectures using asm-generic/mmu_context.h who actually have
an MMU.

Fixes: 62e88b1c00de 'mm: Make arch_unmap()/bprm_mm_init() available to all architectures'
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: linux-arch@vger.kernel.org
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20141122163711.0F037EE6@viggo.jf.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-generic/mmu_context.h

@@ -42,9 +42,4 @@ static inline void activate_mm(struct mm_struct *prev_mm,
 {
 }
 
-static inline void arch_bprm_mm_init(struct mm_struct *mm,
-			struct vm_area_struct *vma)
-{
-}
-
 #endif /* __ASM_GENERIC_MMU_CONTEXT_H */