__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 <thin...@linux.vnet.ibm.com>

Reviewed-by: David Christensen <d...@linux.vnet.ibm.com>

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