IDLE SCREEN键盘锁与解锁
开机函数执行过程（倒过来看）：
EntryIdleScreen() line 3082
BeforeEntryIdleScr() line 5254
mmi_bootup_entry_network_searching() line 1464
mmi_bootup_exit_welcome_screen() line 1390
ShowWelcomeScr() line 5076
exit_custom_startup_screen() line 448
goto_opening_screen() line 419
SimPasswdReqResponse(void * 0x0a890d80 _gSMUPwdDataStruct) line 3950
PowerOnBatteryIndicationCompletePhase2() line 5908 + 10 bytes
mmi_bootup_entry_security_check() line 1311
mmi_bootup_exit_nand_check_query() line 1288
PowerOnBatteryIndicationComplete() line 5974
mmi_bootup_entry_nand_check_query() line 1262
mmi_bootup_exit_low_battery_warning() line 1239
BatteryCheckAfterPowerOnAnimation() line 6012
mmi_bootup_entry_low_battery_warning() line 1213
mmi_bootup_exit_animation() line 1189
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