Merge branch 'r8152-serial-fixes'

Hayes Wang says:

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r8152: serial fixes

v3:
1. Fix the typos for patch #5 and #6.
2. Modify the commit message of patch #9.

v2:
For patch #2, move declaring the variable "ocp_data".

v1:
These patches are used to fix some issues for RTL8153.
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Signed-off-by: David S. Miller <davem@davemloft.net>