soc: qcom: qpnp-haptic: add support for auto mode

Based on the duration of the pattern, haptics mode and other
parameters needs to be configured dynamically for a better
performance and ease of use. Add support for this through device
tree property "qcom,lra-auto-mode".

Add support to configure some parameters like auto resonance
mode, LRA high-Z period, calibration period, vmax along with an
option to override the settings done by auto_mode configuration.

Change-Id: I4706fed4e3ca97d190f907769fd4a9899479b330
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>

Documentation/devicetree/bindings/soc/qcom/qpnp-haptic.txt

@@ -76,6 +76,10 @@ Optional properties when qcom,actuator-type is "lra"
 			at End of Pattern
  - qcom,lra-res-cal-period : Auto resonance calibration period. The values range from
 			4 to 32(default)
+- qcom,lra-auto-mode : If this property is specified, haptics mode for LRA
+		       actuators will be automatically configured along with
+		       other required settings runtime based on the duration
+		       of the pattern.
  - qcom,perform-lra-auto-resonance-search : boolean, define this property if:
 		a) the underlying PMI chip does not have a register in the MISC block to
 		read the error percentage in RC clock