refactor: remove duplicate package import

[liuyueyangxmu]

PR Standards

Opening a pull request should be able to meet the following requirements

github.com/dymensionxyz/roller/utils/eibc was imported twice.
I remove the duplicate import to make the code cleaner and more readable.

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For Author:

• Targeted PR against correct branch
• Included the correct type prefix in the PR title
• Linked to Github issue with discussion and accepted design
• Targets only one github issue
• Wrote unit and integration tests
• All CI checks have passed
• Added relevant godoc comments

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For Reviewer:

• Confirmed the correct type prefix in the PR title
• Reviewers assigned
• Confirmed all author checklist items have been addressed

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After reviewer approval:

• In case PR targets main branch, PR should be squashed and merged.
• In case PR targets a release branch, PR should be rebased.

[liuyueyangxmu]

@mtsitrin Thank you for your approval.

[liuyueyangxmu]

It seems that the CI failure is unrelated to this change

env:
    GOPRIVATE: github.com/dymensionxyz/*
    GH_ACCESS_TOKEN: 
/home/runner/_work/_temp/014aaab4-56c8-4a3d-9d4e-a8ddd3bec9ad.sh: line 1: make: command not found

[artemijspavlovs]

use an alias - eibcutils

[liuyueyangxmu]

use an alias - eibcutils

@artemijspavlovs Thank you for your review.

Modified. Please review it again.