drivers: i2c: octeon: Reduce latency for HS mode

commit 71e333f6fcdc3927c7d10811a9ac5195d10d5221 from
git@git.assembla.com:cavium/WindRiver.linux.git

In high-speed mode, clear IFLG early to release SCL line.
Wait with timeout kernel mechanisms add delay between
data byte transfers and impacts total duration in High
speed mode so use polling with delay.

Change-Id: I2b25cf556ba4fe7724e91190ad476b67109ccfba
Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/37864


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>