linuxkpi: unbreak linux_i2cbb

linuxkpi: unbreak linux_i2cbb

This is a joint work with manu.

- fixed conditions in do_i2c_transfer and i2c_transfer as linux_i2cbb
  does not set adapter->algo->master_xfer but does set
  adapter->algo_data;
- fixed parent bus specification for linux_i2cbb driver module;
- actually implemented iicbb_transfer method;
- added iicbb_pre_xfer and iicbb_post_xfer methods;
- removed unnecessary and harmful delays (and other extra logic) from
  iicbb methods as iicbb driver already has them;
- added setting of iicbb speed based on algo_data->udelay, so that iicbb
  uses correct delays;

PR:		265920
Fixes:		1961a14a4743 linuxkpi: Add i2c support
MFC after:	2 weeks
Sponsored by:	Beckhoff Automation GmbH & Co. KG (manu's work)