MIPS: zboot: Fix the build with XZ compression on older GCC versions

MIPS: zboot: Fix the build with XZ compression on older GCC versions

Some older GCC version (at least 4.6) emits calls to __bswapsi2() when
building the XZ decompressor. The link of the compressed image then
fails with the following error:

arch/mips/boot/compressed/decompress.o: In function '__fswab32':
include/uapi/linux/swab.h:60: undefined reference to '__bswapsi2'

Add bswapsi.o to the link to fix the build with these versions.

Signed-off-by: Alban Bedel <[email protected]>
Cc: Andrew Bresticker <[email protected]>
Cc: Alex Smith <[email protected]>
Cc: Wu Zhangjin <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/12232/
Signed-off-by: Ralf Baechle <[email protected]>