i2c: i801: make FEATURE_BLOCK_PROC dependent on FEATURE_BLOCK_BUFFER

According to the datasheet the block process call requires block
buffer mode. The user may disable block buffer mode by module
parameter disable_features, in such a case we have to clear
FEATURE_BLOCK_PROC.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>