kernel - Adjust devlcass arg for DRIVER_MODULE_ORDERED() macro

* Adjust the argument to pass in &devclass instead of having the macro
add the '&'. This allows NULL to be passed in, for better Fre

kernel - Adjust devlcass arg for DRIVER_MODULE_ORDERED() macro

* Adjust the argument to pass in &devclass instead of having the macro
add the '&'. This allows NULL to be passed in, for better FreeBSD
compatibility.

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drm/radeon: Remove some unused code.

The last usage of it was removed in 857ba049f77abf52192114507b738ab0.

Reported-by: Sergey Zigachev <s.zi@outlook.com>

drm: enable amdgpu module build; update radeon to use updated ttm api

Use ${} instead of $() in various makefiles

Also use ${.TARGET} and ${.ALLSRC] wherever impossible.

Minor style adjustment in at(1)'s makefiles.