linux-generic: use one uniform call systemcpu()
linux-generic: use one uniform call systemcpu()

Currently there are two systemcpu() functions, one is for some specific
platforms and the other is for default dummy, but most of the contents
are same except for sysinfo->cache_line_size: one is true data from
calling systemcpu_cache_line_size() and another is dummy data.
In such a situation we can create another systemcpu_cache_line_size() to
return dummy data for platforms which are lack of it, then only one
function systemcpu() is enough.

Signed-off-by: Hongbo Zhang <c83edf2d9f5c651ac0ba779a340f8d3b49737461@linaro.org>
Reviewed-and-tested-by: Bill Fischofer <52f3c909d51cc5d355a68a403df6906b3c1a8f83@linaro.org>
Signed-off-by: Maxim Uvarov <db4d16e02ae2d7493db430203537da8b2e34f290@linaro.org>

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