[Arista] Remove pcie device monitoring for 7260CX3-64 (#12734)

On some products from this line one of the management NIC might be unpopulated.
On such products this leads to errors from pcied and pcie-check.sh

How I did it
Remove this PCIe device from pcie.yaml

How to verify it
Run pcieutil check on the 2 hardware variants and validate that it passes.
Restart pcied and make sure that there is no more error logs in the syslog.

ADO: 25447788

device/arista/x86_64-arista_7260cx3_64/pcie.yaml

@@ -100,12 +100,6 @@
   id: 8c24
   name: 'Signal processing controller: Intel Corporation 8 Series Chipset Family Thermal
     Management Controller (rev 05)'
-- bus: '01'
-  dev: '00'
-  fn: '0'
-  id: '1682'
-  name: 'Ethernet controller: Broadcom Limited NetXtreme BCM57762 Gigabit Ethernet
-    PCIe (rev 20)'
 - bus: '02'
   dev: '00'
   fn: '0'