RDKEMW-17755: Update RTK specific kernel settings with defaults and o…

[plaksh002c-public]

…ver-ride settings.

[Copilot]

Pull request overview

Updates the RDK sysctl recipe/template so RTK-specific VM kernel parameters (swappiness, vfs_cache_pressure, watermark_scale_factor) are machine-configurable with sensible defaults, while preserving the prior default runtime behavior.

Changes:

• Added default BitBake variables for vm.swappiness, vm.vfs_cache_pressure, and vm.watermark_scale_factor.
• Updated do_install() to substitute the new variables into the generated 98-sysctl-mw.conf.
• Converted the sysctl config file entries from hard-coded values to template placeholders.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
recipes-core/sysctl/rdksysctl.bb	Introduces defaults and adds sed substitutions to generate sysctl config with per-machine overrides.
recipes-core/sysctl/files/98-sysctl-mw.conf	Replaces hard-coded VM values with template tokens consumed by the recipe.

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