driver core: platform: fix ups for constant struct device_driver

Fix up a few places in the platform core code that can easily handle
struct device_driver being constant.  This is part of the work to make
all struct device_driver pointers be constant.

Cc: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20240611130103.3262749-8-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>