drm/amd/amdgpu/smu_v11_0_i2c: Provide descriptions for 'control' and 'data' params

Fixes the following W=1 kernel build warning(s):

drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c:225: warning: Function parameter or member 'control' not described in 'smu_v11_0_i2c_transmit'
drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c:325: warning: Function parameter or member 'control' not described in 'smu_v11_0_i2c_receive'
drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c:325: warning: Function parameter or member 'data' not described in 'smu_v11_0_i2c_receive'

Cc: Alex Deucher <[e-mail]>
Cc: "Christian König" <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c

···
 /**
  * smu_v11_0_i2c_transmit - Send a block of data over the I2C bus to a slave device.
  *
+ * @control: I2C adapter reference
  * @address: The I2C address of the slave device.
  * @data: The data to transmit over the bus.
  * @numbytes: The amount of data to transmit.
···
 /**
  * smu_v11_0_i2c_receive - Receive a block of data over the I2C bus from a slave device.
  *
+ * @control: I2C adapter reference
  * @address: The I2C address of the slave device.
+ * @data: Placeholder to store received data.
  * @numbytes: The amount of data to transmit.
  * @i2c_flag: Flags for transmission
  *