arm: common: For single cores do not use smp_call_function_single

Use smp_call_function_single only for SMP systems. For
single cores, call the function directly. Use CONFIG_SMP
to determine if its a SMP system.

Change-Id: I310d8e449ba1fd00318cb4454b3bc840f67230aa
Signed-off-by: Suren Eda Naarayana Kulothungan <sedanaar@codeaurora.org>
(cherry picked from commit 2c9001b514daecea0433ed0e23fc60b1513ac379)