conf: deduplicate dwc config logic

Move the core dwc(4) file entries to the MI conf/files.
Platform-specific versions e.g. rk_dwc are retained in their current
position. On arm64 this necessitates a

conf: deduplicate dwc config logic

Move the core dwc(4) file entries to the MI conf/files.
Platform-specific versions e.g. rk_dwc are retained in their current
position. On arm64 this necessitates adding an additional 'device dwc'
option.

This hardware is found on several available/emerging RISC-V SoCs, so we
will soon need it on this architecture.

Reviewed by: manu
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D44103

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Add Combo PHY, RK817, Syr827, tcs4525 pmic devices to Rockchip specific config.

Add eqos device to Rockchip specific config.

Add Rockchip RK3568 SoC

Attach its clock drivers and rk817 pmic driver to the build.

arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one

arm64: Add per SoC family kernel config

There is multiple reason for this :
- This makes it easier to see which driver is needed for each SoC
- This makes it easier to create a custom config for one SoC
- This really reduce boot time (which some people might want)

Some explaination about the files :
- std.arm64 contains all standard kernel option
- std.dev contains all the standard kernel devices
- std.<soc> contains all drivers needed to boot on this SoC family
- <SOC> includes std.arm64, std.dev and std.<soc>
- GENERIC includes std.arm64, std.dev and all std.<soc>

Sponsored by: Diablotin Systems
MFC After: 2 months
Reviewed by: mmel, cognet, imp
Differential Revision: https://reviews.freebsd.org/D30474

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