OvmfPkg/ResetSystemLib: clean up library dependencies

OvmfPkg/ResetSystemLib: clean up library dependencies

Annotate the #include directives with the interfaces that this lib
instance needs from the included lib class headers. This will help us keep
the #include set minimal, when we move code around later.

While at it, synchronize the [LibraryClasses] section with the #include
directives -- list BaseLib.

Also #include the ResetSystemLib class header, which declares the
interfaces that this lib instance implements.

This forces us to spell out the "MdeModulePkg.dec" dependency too, under
[Packages].

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2675
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200417153751.7110-3-lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Rebecca Cran <rebecca@bsdio.com>