UPSTREAM: nvmem: provide nvmem_dev_name()

Kernel users don't have any means of checking the names of nvmem
devices. Add a routine that returns the name of the nvmem provider.

This will be useful for future nvmem notifier subscribers - otherwise
they can't check what device is being added/removed.

Bug: 154188491
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit d7b9fd1669d4a4f38281c4e29f1408e1bdce09b3)
Signed-off-by: Will McVicker <willmcvicker@google.com>
Change-Id: Iecea6bb4844e87eadd4225b08c789a58029438d9