printllval: fix 64bit unpacking on mips/o32 and xtensa

printllval: fix 64bit unpacking on mips/o32 and xtensa

The mips/o32 ABI and xtensa arch also do 64bit aligning, so add it to the
printllval list for this.

Normally for sys_fadvise64_64 we'd handle the same list of arches, but
mips/o32 ABI is funky and doesn't shift -- it has 7 args.  So just add
xtensa to it.

* file.c (sys_fadvise64_64): Add XTENSA to the shifted list.
* util.c (printllval): Add LINUX_MIPSO32 and XTENSA to the shifted list.