sim: it is not necessary to call restore_critical_section in irq

Remove restore_critical_section() call from up_switch_context() in simulator
as it is not necessary during interrupt context switching. The critical
section state is properly managed elsewhere in the interrupt handling flow.

Signed-off-by: hujun5 <hujun5@xiaomi.com>

arch/sim/src/sim/sim_switchcontext.c

@@ -70,10 +70,6 @@ void up_switch_context(struct tcb_s *tcb, struct tcb_s *rtcb)
 
       sim_savestate(rtcb->xcp.regs);
 
-      /* Restore the cpu lock */
-
-      restore_critical_section(tcb, this_cpu());
-
       /* Then switch contexts */
 
       sim_restorestate(tcb->xcp.regs);