ARM: 7741/1: mcpm_platsmp.c: remove empty smp_init_cpus method

The smp_init_cpus method in the smp_operations structure is optional
and can be omitted entirely.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>