[infiniband] Always call ib_link_state_changed() in ib_smc_update()

[infiniband] Always call ib_link_state_changed() in ib_smc_update()

ib_smc_update() potentially updates the Infiniband port state, and so
should almost always be followed by a call to ib_link_state_changed().
The one exception is the call made to ib_smc_update() before the
device is registered.

Fix by removing explicit calls to ib_link_state_changed() from drivers
using ib_smc_update(), including a call to ib_link_state_changed()
within ib_smc_update(), and creating a separate ib_smc_init() for use
prior to device registration.

Signed-off-by: Michael Brown <mcb30@ipxe.org>