vt82c686: Remove vt82c686b_[am]c97_init() functions

These are legacy init functions that are just equivalent to directly
calling pci_create_simple so do that instead. Also rename objects to
lower case via-ac97 and via-mc97 matching naming of other devices.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <1c4373c8aeb6c4fb2a8df2c864b0e91a977a3d7b.1609584216.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>