linux-generic: sysinfo: rename odp_cpu_hz_current with odp_ prefix
linux-generic: sysinfo: rename odp_cpu_hz_current with odp_ prefix

This function will be moved to their own platform specific files too,
it is better to be named with a odp_ prefix.

Signed-off-by: Hongbo Zhang <c83edf2d9f5c651ac0ba779a340f8d3b49737461@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

rsalveti/odp,erachmi/odp,dkrot/odp,dkrot/odp,nmorey/odp,rsalveti/odp,erachmi/odp,erachmi/odp,rsalveti/odp,nmorey/odp,erachmi/odp,nmorey/odp,mike-holmes-linaro/odp,mike-holmes-linaro/odp,nmorey/odp,mike-holmes-linaro/odp,ravineet-singh/odp,dkrot/odp,mike-holmes-linaro/odp,rsalveti/odp,ravineet-singh/odp,dkrot/odp,ravineet-singh/odp,rsalveti/odp,ravineet-singh/odp