!228 修正在arm cortext的smp时,中断返回时未正确恢复用户tpidr寄存器的问题

Merge pull request !228 from jesven/fix_smp_user_setting

libcpu/arm/cortex-a/context_gcc.S

@@ -155,9 +155,10 @@ rt_hw_context_switch_interrupt:
 
     ldr     sp, [r2]
     mov     r0, r3
-
+    mov     r4, r0
     bl      rt_cpus_lock_status_restore
-
+    mov     r0, r4
+    bl      lwp_user_setting_restore
     b       rt_hw_context_switch_exit
 
 #else /*RT_USING_SMP*/