ufs: Remove redundant platform_set_drvdata()

Commit 0998d063 (device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.

Change-Id: Ieba8247956c08cab78e250ca73b36e30795f219e
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Santosh Y <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Git-commit: 123f87758658285f5f844d7e8a8b974ce88d1ffc
Git-repo: https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git


Signed-off-by: Dolev Raviv <draviv@codeaurora.org>