Documentation: afe4404: Add DT bindings for the AFE4404 heart monitor

Add the TI afe4404 heart monitor DT bindings documentation.
Create health directory created under iio.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/devicetree/bindings/iio/health/afe4404.txt b/Documentation/devicetree/bindings/iio/health/afe4404.txt
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+++ b/Documentation/devicetree/bindings/iio/health/afe4404.txt
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+Texas Instruments AFE4404 Heart rate and Pulse Oximeter
+
+Required properties:
+ - compatible          : Should be "ti,afe4404".
+ - reg                 : I2C address of the device.
+ - tx-supply           : Regulator supply to transmitting LEDs.
+ - interrupt-parent    : Phandle to he parent interrupt controller.
+ - interrupts          : The interrupt line the device ADC_RDY pin is
+                         connected to. For details refer to,
+                         ../interrupt-controller/interrupts.txt.
+
+Optional properties:
+ - reset-gpios         : GPIO used to reset the device.
+                         For details refer to, ../gpio/gpio.txt.
+
+Example:
+
+&i2c2 {
+       heart_mon@58 {
+               compatible = "ti,afe4404";
+               reg = <0x58>;
+
+               tx-supply = <&vbat>;
+
+               interrupt-parent = <&gpio1>;
+               interrupts = <28 IRQ_TYPE_EDGE_RISING>;
+
+               reset-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
+       };
+};