[202012][Arista] Clear all reload cause after reading (#15925)

### Why I did it
On 202012 images, there is an issue that certain reload causes are not cleared after reading and the uncleared causes may confuse the following reboot-cause reading after warm-reboot to master/202305.

##### Work item tracking
- Microsoft ADO **(number only)**: 24378183

#### How I did it
Clear the reload cause even in the case that it is determined as not important. 

#### How to verify it
1) Cold-boot to 202012
2) Warm-reboot to master
3) Check the reboot cause is 'warm-reboot' by 'show reboot-cause'
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byu343 2023-07-31 15:02:44 -07:00 committed by GitHub
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Subproject commit a682da369cbbab66dd477ca573dfe12f52c74c9c Subproject commit f7b5e982ea9656f0f33940016bf4788ff2f69b97