ext4: Convert the usage of NR_CPUS to nr_cpu_ids.

NR_CPUS can be really large. We should be using nr_cpu_ids instead.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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