linux: posix_fadvise: restore implementation for xtensa part II

[valentin popa]

Hi Baruch,
I've attached a patch that you sent a while ago.
The problem with it is that is made based on an arm fix, and fixes a xtensa
issue, but brakes the other platforms that defines __NR_fadvise64. I can
try to send a patch for this but for sure I will break xtensa, so maybe you
can do it much better.
Thanks!
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