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I2C slave can get stuck during a transfer and may hold I2C data line. In that case, I2C slave might require 9 clock pulses from I2C master to release the data line. Add bus clear support to recover I2C bus in above mentioned scenario. Change-Id: I51e896c84ddc97960eedbd2f828293a6d45a2604 Signed-off-by: Ashish Kori <akori@codeaurora.org>