__ppc_get_timebase() is GNU extension and is more efficient

   v2: Advoid breaking other ppc_64 flatforms. The __ppc_get_timebase()
       seems to be specific to powerpc platform and with GLIBC.

Signed-off-by: Thinh Tran <[email protected]>

Reviewed-by: David Christensen <[email protected]>

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