I2C decoder path and slave address

The video capture API includes constants for specifying the path and slave address for an I2C decoder.

The following specify the I2C decoder path and slave address:

CAPTURE_PROPERTY_DECODER_I2C_PATH
CAPTURE_PROPERTY( 'Q', 'D', 'I', 'P' )
Read/Write const char *
Device path of the I2C decoder (e.g. /dev/i2c0).
CAPTURE_PROPERTY_DECODER_I2C_ADDR
CAPTURE_PROPERTY( 'Q', 'D', 'I', 'A' )
Read/Write uint32_t
Slave address of the I2C decoder.