vf_i2c: update I2C controller logic

Update the I2C controller logic to be more consistent with the
newer version of the controller reference manual.
This makes it work better on modern LS/LX platfor

vf_i2c: update I2C controller logic

Update the I2C controller logic to be more consistent with the
newer version of the controller reference manual.
This makes it work better on modern LS/LX platforms and avoids
unnecessary delays. Also fixes a lock leak.

Tested by: bz (LS1088a FDT), Pierre-Luc Drouin (Honeycomb, ACPI)

(cherry picked from commit 44847114bd4c61ed3dfcc879fa0d7deb452e12d3)

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vf_i2c: split up and add ACPI attachments in addition to FDT

Move the code from the arm specific to the iicbus controller directory.
Split up between general logic and bus attachment code.
Add suppo

vf_i2c: split up and add ACPI attachments in addition to FDT

Move the code from the arm specific to the iicbus controller directory.
Split up between general logic and bus attachment code.
Add support for ACPI attachment in addition to FDT.

Tested by: bz (LS1088a FDT), Pierre-Luc Drouin (Honeycomb, ACPI)
Based on: D24917 by Val Packett (initial early version)

(cherry picked from commit 5ca8e32633c4ffbbcd6762e5888b6a4ba0708c6c)

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