UPSTREAM: i2c: make i2c_parse_fw_timings() always visible

UPSTREAM: i2c: make i2c_parse_fw_timings() always visible

This function used to be DT only, so it lived inside a CONFIG_OF block.
Now it uses device attributes and must be moved outside of it. No
further code changes, only one whitespace improvement.

Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 54177ccfbe95fcf250a89508a705bfe4706e3b86)

Change-Id: Ie7a73fef09266a97be4d1f50efc295428357c84c