cleanup uneeded include of errno.h

Author: clemdiep

so3/kernel/psci_smp.c

@@ -13,7 +13,6 @@
  * Author: Will Deacon <will.deacon@arm.com>
  */
 
-#include <errno.h>
 #include <spinlock.h>
 #include <smp.h>
 #include <psci.h>

so3/kernel/spin_table.c

@@ -13,7 +13,6 @@
  * Author: Will Deacon <will.deacon@arm.com>
  */
 
-#include <errno.h>
 #include <spinlock.h>
 #include <smp.h>
 #include <psci.h>

so3/mm/percpu.c

@@ -19,7 +19,6 @@
 #include <common.h>
 #include <memory.h>
 #include <heap.h>
-#include <errno.h>
 #include <string.h>
 #include <percpu.h>