timer: get TSC frequency from /proc/cpuinfo
timer: get TSC frequency from /proc/cpuinfo

TSC frequency was guessed by reading CLOCK_MONOTONIC_RAW or sleeping 1 sec.
Now, read frequency from cpuinfo first.
Keep other methods as fallbacks.

Signed-off-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>
Acked-by: Ivan Boule <8408c61bea57ac94dd0d4dac44b115be1b288952@6wind.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk