Input: drv260x - remove unused defines

Removing some #defines that are not and should never be used pertaining to
I2C.

Removing:
define DRV260X_ALLOWED_R_BYTES	25
define DRV260X_ALLOWED_W_BYTES	2
define DRV260X_MAX_RW_RETRIES	5
define DRV260X_I2C_RETRY_DELAY 10

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Input: drv260x - add check for ERM mode and LRA Libraries

Add a check to ensure that LRA libraries are not mixed with the ERM mode.
If ERM mode and the Library is empty "OR" the LRA library then exit, as the
LRA and empty libraries are not applicable for the ERM actuator.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Input: drv260x - fix binding document

Update the drv260x dt binding document:
- Change the node name to the devices function not the device name.
- Add vbat-supply to the example.
- Fix indentation of the example.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>