Servo V3: Add version specific interface to params

This change allows params to specify an interface depending on servo
versions. This is required by servoflex_v2_r0_p50 as the pca9534
chip is on a separate i2c bus than the other gpio expanders.

TEST=local setup with spring. Tested toggling spi2_buf_on_flex_en.
Ensured servo_v2 still works.

Change-Id: Ic6d706b73ade074bb597a40c8c5df62dc2eaa99f
Reviewed-by: Todd Broch <>
Commit-Queue: Simran Basi <>
Reviewed-by: Simran Basi <>
Tested-by: Simran Basi <>
3 files changed