fix: enable kernel quota and loop support

[kvinwang]

Summary

• enable VFS quota and v2 quota format support for ext4 project quotas
• build the loop block driver into the kernel for filesystem-image workloads
• keep both generic facilities in the base dstack.cfg kernel fragment rather than the Sysbox-specific fragment

Testing

• bitbake -c kernel_configcheck virtual/kernel
• bitbake virtual/kernel
• verified the generated kernel config contains CONFIG_QUOTA=y, CONFIG_QFMT_V2=y, CONFIG_QUOTA_TREE=y, CONFIG_QUOTACTL=y, and CONFIG_BLK_DEV_LOOP=y

Fixes Dstack-TEE/meta-dstack#80

[Copilot]

Pull request overview

This PR updates the Yocto kernel configuration fragment (dstack.cfg) to ensure quota support needed for ext4 project quotas and to build the loop block device driver into the kernel, supporting filesystem-image-based workload storage.

Changes:

• Enable kernel quota support (CONFIG_QUOTA=y) and v2 quota format support (CONFIG_QFMT_V2=y) to support ext4 project quotas.
• Build the loop block driver into the kernel (CONFIG_BLK_DEV_LOOP=y) for filesystem-image workloads.
• Keep these generic capabilities in the base dstack.cfg fragment.

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