serial: sprd: Remove unused structure

Remove the unused reg_backup structure.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baolin Wang 2018-09-17 11:33:40 -07:00 • committed by Greg Kroah-Hartman
commit 20464f3a9b