LF-4558-2 input: touch: goodix: change the i2c data length to a small one

Do not need to read quite large data through i2c bus, accroding to driver
logic, only need the first 8 byte data. So change this length to 9.

Add this change also can fix one error on imx8ulp-evk board, because the
touch is on rpmsg-i2c bus, rpmsg limitate the data size, can't be large
than 14 byte. If config a large data size, will trigger i2c error.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>