Fix bug in reading the I2C_BUFFSTAT register for getting byte count on RX/TX interrupt.

On Interrupt: I2C_STAT[RDR],
	read 'RXSTAT' from I2C_BUFFSTAT[8-13]
On Interrupt: I2C_STAT[XDR]
	read 'TXSTAT' from I2C_BUFFSTAT[0-5]
Signed-off-by: NJagadeesh Pakaravoor <j-pakaravoor@ti.com>
Signed-off-by: NMoiz Sonasath <m-sonasath@ti.com>
Signed-off-by: NVikram pandita <vikram.pandita@ti.com>
[ben-linux@fluff.org: fixed mail format and added i2c-omap to subject]
Signed-off-by: NBen Dooks <ben-linux@fluff.org>