pass: Clean up duplicate variables for num_cpus

pass: Clean up duplicate variables for num_cpus

This patch cleans up duplicate variables meaning number of CPUs in a
resource. From now, there are only two variables that indicate the
number of CPUs. One is num_cpus in struct pass_conf_data and this is the
value from the resource conf file. The other is the num_cpus in struct
pass_hotplug and this means the possible maximum number of online CPUs.
Currently, the values of these two variables are equivalently assigned
the value in the conf file.However, the latter would be changed by the
upcoming patch as its original intention.

Change-Id: I289247d7dd5611ccfb2030dc5eeefdda83408307
Signed-off-by: Wook Song <wook16.song@samsung.com>