Added missing sai_interface_type_auto_detect on Arista-7060CX-32S-Q32 to fix oper down and Syncd crash on cold boot (#24120)

fixes: #23943

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#### Why I did it
Fix a bug on the Arista-7060CX-32S-Q32
##### Work item tracking
- Microsoft ADO **(number only)**: 34827366

#### How I did it
Added a missing configuration line

#### How to verify it

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I tested this by manually adding
```
sai_interface_type_auto_detect=0
```
to the `th-a7060-cx32s-32x40G-t0.config.bcm` file on an Arista-7060CX-32S-Q32 (the same one that was used to originally repro in #23943) running 202505 then did a cold reboot.

After boot all ports were operationally up and there were no SYNCD dumps seen in syslog

Also, tested warmboot from 202411->202505 and 202505->202505 with the fix in place and there were no SYNCD dumps seen in syslog and the interfaces came up.

#### Which release branch to backport (provide reason below if selected)

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- [ ] 202205
- [ ] 202211
- [ ] 202305
- [ ] 202311
- [ ] 202405
- [ ] 202411
- [x] 202505

#### Tested branch (Please provide the tested image version)

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- [x] 202505.21

#### Description for the changelog
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pull request for inclusion in the changelog:
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Added missing sai_interface_type_auto_detect option on Arista-7060CX-32S to resolve syncd crash
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Author: mssonicbld

device/arista/x86_64-arista_7060_cx32s/Arista-7060CX-32S-Q32/th-a7060-cx32s-32x40G-t0.config.bcm

@@ -447,5 +447,7 @@ serdes_preemphasis_108=0x145c00
 serdes_driver_current_109=0x4
 serdes_preemphasis_109=0x145c00
 
+sai_interface_type_auto_detect=0
+
 mmu_init_config="MSFT-TH-Tier0"
 phy_an_lt_msft=1