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This commit introduces two changes:
- remove hardcoded references to mci0 from the driver
- perform mci optimization for all mci interfaces

It fixes performance issues observed on cn9132 CP2.

Change-Id: I4e040cd54ff95c9134035ac89b87d8feb28e9eba
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>