powerpc/mm: Fix makefile for KASAN

In commit 17312f25 ("powerpc/mm: Move book3s32 specifics in
subdirectory mm/book3s64"), ppc_mmu_32.c was moved and renamed.

This patch fixes Makefiles to disable KASAN instrumentation on
the new name and location.

Fixes: f072015c ("powerpc: disable KASAN instrumentation on early/critical files.")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/Makefile

@@ -5,12 +5,6 @@
 
 ccflags-$(CONFIG_PPC64)	:= $(NO_MINIMAL_TOC)
 
-KASAN_SANITIZE_ppc_mmu_32.o := n
-
-ifdef CONFIG_KASAN
-CFLAGS_ppc_mmu_32.o  		+= -DDISABLE_BRANCH_PROFILING
-endif
-
 obj-y				:= fault.o mem.o pgtable.o mmap.o \
 				   init_$(BITS).o pgtable_$(BITS).o \
 				   pgtable-frag.o \

arch/powerpc/mm/book3s32/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
+KASAN_SANITIZE_mmu.o := n
+
+ifdef CONFIG_KASAN
+CFLAGS_mmu.o  		+= -DDISABLE_BRANCH_PROFILING
+endif
+
 obj-y += mmu.o hash_low.o mmu_context.o tlb.o