Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

mii: Add opt_platform.h to all miibus drivers

miivar.h includes opt_platform.h. Make sure all the drivers that use the
miibus_if.h interface file have opt_platform.h as well. While some of
these may

mii: Add opt_platform.h to all miibus drivers

miivar.h includes opt_platform.h. Make sure all the drivers that use the
miibus_if.h interface file have opt_platform.h as well. While some of
these may not, strictly speaking, need it, it's easier to include it
universally for miibus.

Sponsored by: Netflix

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enetc: Add autogenerated files to Makefile

A module makefile must list all the header files it uses which are
generated at build time from interface definitions (.m files) in its
SRCS list.

Fixes:

enetc: Add autogenerated files to Makefile

A module makefile must list all the header files it uses which are
generated at build time from interface definitions (.m files) in its
SRCS list.

Fixes: 5ad6d28cbe6b ("enetc: Support building the driver as a loadable module.")

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enetc: Support building the driver as a loadable module.

Function level reset has to be done in attach in order to put the
hardware in a known state before configuring it.
The order of DRIVER_MODULE

enetc: Support building the driver as a loadable module.

Function level reset has to be done in attach in order to put the
hardware in a known state before configuring it.
The order of DRIVER_MODULEs was changed to ensure that the miibus driver
is loaded when mii_attach is called.

Obtained from: Semihalf
Sponsored by: Alstom Group

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