Enable Cypress M8 USB serial driver for all targets

[sairon]

Build cypress_m8 driver as module for all targets - some of them had it in their base defconfig while some not. It is required e.g. for UPB PIM (Powerline Interface Module).

Fixes #3690

Summary by CodeRabbit

• New Features

  • Added support for Cypress M8 USB serial devices, enhancing compatibility with additional USB hardware.

• Improvements

  • Expanded USB-related configurations to improve functionality and support for various USB devices.
  • Updated multimedia subsystem options for better video and audio processing capabilities.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes in this pull request introduce a new configuration option for the Cypress M8 USB serial driver in two kernel configuration files. The CONFIG_USB_SERIAL_CYPRESS_M8 option is enabled in both device-support.config and kernel-arm64-rockchip.config, expanding support for USB serial devices. The modifications include enabling additional USB-related configurations without altering existing entries significantly, ensuring that the overall structure of the configuration files remains intact.

Changes

File Path	Change Summary
buildroot-external/kernel/v6.6.y/device-support.config	Added CONFIG_USB_SERIAL_CYPRESS_M8=m
buildroot-external/kernel/v6.6.y/kernel-arm64-rockchip.config	Updated CONFIG_USB_SERIAL_CYPRESS_M8 from commented out to m

Assessment against linked issues

Objective	Addressed	Explanation
Enable driver support for UPB PIM (USB) (#3690)	✅

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between b288cd2 and 75fd9d0.

📒 Files selected for processing (2)

• buildroot-external/kernel/v6.6.y/device-support.config (1 hunks)
• buildroot-external/kernel/v6.6.y/kernel-arm64-rockchip.config (0 hunks)

💤 Files with no reviewable changes (1)

• buildroot-external/kernel/v6.6.y/kernel-arm64-rockchip.config

🔇 Additional comments (2)

buildroot-external/kernel/v6.6.y/device-support.config (2)

16-16: LGTM! The change correctly enables the Cypress M8 driver.

The addition of CONFIG_USB_SERIAL_CYPRESS_M8=m is well-placed within the USB serial drivers section and follows the established pattern of building drivers as modules. This change will enable the driver across all targets while maintaining consistency with the existing configuration structure.

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16-16: Verify UPB PIM detection with the new driver.

Let's confirm this change resolves the UPB PIM detection issue mentioned in #3690.

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