driver core: fixup for "driver core: make struct bus_type.uevent() take a const *"

driver core: fixup for "driver core: make struct bus_type.uevent() take a const *"

After merging the driver-core tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

arch/powerpc/platforms/ps3/system-bus.c:472:19: error: initialization of 'int (*)(const struct device *, struct kobj_uevent_env *)' from incompatible pointer type 'int (*)(struct device *, struct kobj_uevent_env *)' [-Werror=incompatible-pointer-types]
  472 |         .uevent = ps3_system_bus_uevent,
      |                   ^~~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/ps3/system-bus.c:472:19: note: (near initialization for 'ps3_system_bus_type.uevent')
arch/powerpc/platforms/pseries/ibmebus.c:436:22: error: initialization of 'int (*)(const struct device *, struct kobj_uevent_env *)' from incompatible pointer type 'int (*)(struct device *, struct kobj_uevent_env *)' [-Werror=incompatible-pointer-types]
  436 |         .uevent    = ibmebus_bus_modalias,
      |                      ^~~~~~~~~~~~~~~~~~~~
arch/powerpc/platforms/pseries/ibmebus.c:436:22: note: (near initialization for 'ibmebus_bus_type.uevent')

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 2a81ada32f0e ("driver core: make struct bus_type.uevent() take a const *")
Link: https://lore.kernel.org/r/20230130152818.03c00ea3@canb.auug.org.au
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>