lib/raid6: Drop IA64 support

Drop Itanium support from the RAID6 code, and along with it, the 16x and
32x unrolled versions, which were only used by IA64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

lib/raid6/Makefile

@@ -2,7 +2,7 @@
 obj-$(CONFIG_RAID6_PQ)	+= raid6_pq.o
 
 raid6_pq-y	+= algos.o recov.o tables.o int1.o int2.o int4.o \
-		   int8.o int16.o int32.o
+		   int8.o
 
 raid6_pq-$(CONFIG_X86) += recov_ssse3.o recov_avx2.o mmx.o sse1.o sse2.o avx2.o avx512.o recov_avx512.o
 raid6_pq-$(CONFIG_ALTIVEC) += altivec1.o altivec2.o altivec4.o altivec8.o \
@@ -55,7 +55,7 @@ endif
 quiet_cmd_unroll = UNROLL  $@
       cmd_unroll = $(AWK) -v N=$* -f $(srctree)/$(src)/unroll.awk < $< > $@
 
-targets += int1.c int2.c int4.c int8.c int16.c int32.c
+targets += int1.c int2.c int4.c int8.c
 $(obj)/int%.c: $(src)/int.uc $(src)/unroll.awk FORCE
 	$(call if_changed,unroll)