usb: typec: tipd: Don't read/write more bytes than required

tps6598x_block_read/write always read 65 bytes of data even when much
less is required when I2C_FUNC_I2C is used. Reduce this to the correct
number.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20210914140235.65955-1-sven@svenpeter.dev


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>