ARM: nommu: add stub local_flush_bp_all() for !CONFIG_MMUU

Since the merging of Will's tlb-ops branch, specifically 89c7e4b8bbb3
(ARM: 7661/1: mm: perform explicit branch predictor maintenance when required),
building SMP without CONFIG_MMU has been broken.

The local_flush_bp_all function is only called for operations related to
changing the kernel's view of memory and ASID rollover - both of which are
irrelevant to an !MMU kernel.

This patch adds a stub local_flush_bp_all() function to the other tlb
maintenance stubs and restores the ability to build an SMP !MMU kernel.

Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>

arch/arm/include/asm/tlbflush.h

@@ -549,6 +549,7 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned lon
 static inline void local_flush_tlb_kernel_page(unsigned long kaddr)						{ }
 static inline void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)	{ }
 static inline void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)				{ }
+static inline void local_flush_bp_all(void)									{ }
 
 extern void flush_tlb_all(void);
 extern void flush_tlb_mm(struct mm_struct *mm);
@@ -556,6 +557,7 @@ extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
 extern void flush_tlb_kernel_page(unsigned long kaddr);
 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
+extern void flush_bp_all(void);
 #endif	/* __ASSEMBLY__ */
 
 #endif