ARC: Adjust cpuinfo for non-continuous cpu ids

num_possible_cpus() returns how many CPUs may be present on system.
However we want the highest possible CPU number.
This may be differ in a sparsed possible CPUs map.
Such map achived by OF for plat-eznps.

For example if we have:
possible cpus mask 0,3

Then:
num_possible_cpus() is equal 2
	while
nr_cpu_ids is equal 4.

Only for value 4 c_start() will provide correct cpuinfo at procfs.

Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

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