cisco_*: remove duplicate fields

[efd6]

What does this PR do?

This removes duplicate field definitions from the non-deperecated cisco packages.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Updates sei: multiple packages with duplicated field definitions #4398

Screenshots

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🚀 Benchmarks report

Package cisco_meraki 👍(1) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
log	21276.6	14705.88	-6570.72 (-30.88%)	💔

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💚 Build Succeeded

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Build stats

• Start Time: 2022-10-11T07:27:47.984+0000

• Duration: 19 min 51 sec

Test stats 🧪

Test	Results
Failed	0
Passed	266
Skipped	0
Total	266

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (9/9)	💚
Files	95.349% (41/43)	👎 -2.155
Classes	95.349% (41/43)	👎 -2.155
Methods	97.6% (366/375)	👍 7.266
Lines	88.713% (8025/9046)	👎 -2.918
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[kcreddy]

• cisco_nexus.log
  • tags could be removed from base-fields.yml instead of ecs.yml