x86/fpu: Update comment for __raw_xsave_addr()

The comment above __raw_xsave_addr() claims that the function does not
work for compacted buffers and was introduced in:

  b8b9b6ba9dec3 ("x86/fpu: Allow setting of XSAVE state")

In this commit, the function was factored out of get_xsave_addr() and
this function claims that it works with "standard format or compacted
format of xsave area". It accesses the "xstate_comp_offsets" variable
for the actual offset and it was introduced in commit

  7496d6458fe32 ("Define kernel API to get address of each state in xsave area")

Based on the code (back then and now):
- xstate_offsets holds the standard offset.
- if compacted mode is not supported then xstate_comp_offsets gets the
  xstate_offsets copied.
- if compacted mode is supported then xstate_comp_offsets will hold the
  offset for the compacted buffer.

Based on that the function works for compacted buffers as long as the
CPU supports it and this what we care about.

Remove the "Note:" which is not accurate.

Suggested-by: Paolo Bonzini <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: "Jason A. Donenfeld" <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Radim Krčmář <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: kvm ML <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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