valgrind: fix debug info reading error when do memcheck on ppc targets

valgrind: fix debug info reading error when do memcheck on ppc targets

    following is the error message:
        --2263-- WARNING: Serious error when reading debug info
        --2263-- When reading debug info from /lib/ld-2.13.so:
        --2263-- Can't make sense of .got section mapping
        --2263-- WARNING: Serious error when reading debug info
        --2263-- When reading debug info from /home/root/lzh:
        --2263-- Can't make sense of .data section mapping
        --2263-- WARNING: Serious error when reading debug info
        --2263-- When reading debug info from /usr/lib/valgrind/vgpreload_core-ppc32-linux.so:
        --2263-- Can't make sense of .data section mapping
        --2263-- WARNING: Serious error when reading debug info
        --2263-- When reading debug info from /usr/lib/valgrind/vgpreload_memcheck-ppc32-linux.so:
        --2263-- Can't make sense of .data section mapping
        --2263-- WARNING: Serious error when reading debug info
        --2263-- When reading debug info from /lib/libc-2.13.so:
        --2263-- Can't make sense of .data section mapping

(From OE-Core rev: 14626cc76210ed6fe40316a311f24147ed8de8be)

Signed-off-by: Zhenhua Luo <b19537@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>