ena: Update driver version to v2.7.0

Features:

• Introduce customer and SRD metrics through sysctl
• Introduce spreading IRQs to CPUs capability using sysctl
• Upgrade ena-com to v2.7.0

Bug Fixes:

• Remove outdated APIs

Minor Changes:

• Introduce a shared stats sample interval for all stats

Approved by: cperciva (mentor)
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

(cherry picked from commit 4e2688cc762d94b190029f0c5efab9c4bb5521be)