arch_topology: Change return type of topology_parse_cpu_capacity() to bool

topology_parse_cpu_capacity() returns 1 on success and 0 on errors. Make
it return bool instead of int as that suits the purpose better.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Juri Lelli <juri.lelli@arm.com>
Tested-by: Juri Lelli <juri.lelli@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>