ASoC: imx-rpmsg: SND_SOC_IMX_RPMSG should depend on OF and I2C

SND_SOC_IMX_RPMSG should depend on OF and I2C. It fixes the following
error reported by kernel test robot:

ld: sound/soc/fsl/imx-rpmsg.o: in function `imx_rpmsg_late_probe':
imx-rpmsg.c:(.text+0x4f): undefined reference to `i2c_find_device_by_fwnode'

Fixes: 5d9f746c ("ASoC: imx-rpmsg: Force codec power on in low power audio mode")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311230506.DPF9vvYY-lkp@intel.com/Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Link: https://lore.kernel.org/r/20231125065300.6385-1-chancel.liu@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/Kconfig

@@ -360,6 +360,7 @@ config SND_SOC_IMX_HDMI
 config SND_SOC_IMX_RPMSG
 	tristate "SoC Audio support for i.MX boards with rpmsg"
 	depends on RPMSG
+	depends on OF && I2C
 	select SND_SOC_IMX_PCM_RPMSG
 	select SND_SOC_IMX_AUDIO_RPMSG
 	help