[as7326-56x]Fix thermal plan when fan insert back

[jostar-yang]

- Why I did it
When plug out one fan, fan speed will set to 100%. But plug in back fan, speed still is 100%.
- How I did it
Modify code. When fan insert back, fan speed should be depend on thermal plan.
- How to verify it
Run thermal code, plug out fan. And then insert back fan. Check fan speed.
root : DEBUG new_perc=38
root : DEBUG temp2=lm75_49=25500,temp4=lm_4b=24500, temp_get=25000, ori_state=1
(Plug out one fan)

root : DEBUG new_perc=38
root : DEBUG fan_4 fail, set new_perc to 100
root : DEBUG fan_policy_state=3
root : WARNING fan_policy_state is LEVEL_FAN_MAX

...............................
(Plug in back the fan)
root : DEBUG temp=24750
root : DEBUG temp=24750 >= policy[0][0]=0, temp=24750 < policy[0][1]=39000
root : DEBUG fan_state=1
root : DEBUG temp2=lm75_49=25000,temp4=lm_4b=24500, temp_get=24750, ori_state=1
root : DEBUG new_perc=38
root : INFO Set fan speed from 100 to 38
root : DEBUG fan_dir=0, ori_perc=38
................
- Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[lgtm-com]

This pull request introduces 1 alert and fixes 13 when merging 2096eaf into 3987cbd - view on LGTM.com

new alerts:

• 1 for Syntax error

fixed alerts:

• 6 for Unused import
• 4 for Unused local variable
• 2 for Use of 'global' at module level
• 1 for Unreachable code

[lgtm-com]

This pull request introduces 1 alert and fixes 13 when merging 4676d6d into 3987cbd - view on LGTM.com

new alerts:

• 1 for Syntax error

fixed alerts:

• 6 for Unused import
• 4 for Unused local variable
• 2 for Use of 'global' at module level
• 1 for Unreachable code

[lgtm-com]

This pull request fixes 9 alerts when merging 6cf8f1f into 3987cbd - view on LGTM.com

fixed alerts:

• 4 for Unused local variable
• 4 for Unused import
• 1 for Unreachable code

[lgtm-com]

This pull request fixes 5 alerts when merging 6e5a54e into 7df4c0a - view on LGTM.com

fixed alerts:

• 4 for Unused local variable
• 1 for Unreachable code

[lgtm-com]

This pull request fixes 5 alerts when merging ac6e4e9 into f136c53 - view on LGTM.com

fixed alerts:

• 4 for Unused local variable
• 1 for Unreachable code

[lgtm-com]

This pull request introduces 2 alerts and fixes 3 when merging b7c12d3 into 90416b5 - view on LGTM.com

new alerts:

• 2 for Unused local variable

fixed alerts:

• 2 for Unused local variable
• 1 for Unreachable code