perf/x86/intel: Constify the 'lbr_desc[]' array and make a function static

perf/x86/intel: Constify the 'lbr_desc[]' array and make a function static

A few minor clean-ups: constify the lbr_desc[] array and make
local function lbr_from_signext_quirk_rd() static to fix a sparse warning:

  "symbol 'lbr_from_signext_quirk_rd' was not declared. Should it be static?"

Signed-off-by: Colin Ian King <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>