ASoC: rockchip: Use *-y instead of *-objs in Makefile

*-objs suffix is reserved rather for (user-space) host programs while
usually *-y suffix is used for kernel drivers (although *-objs works
for that purpose for now).

Let's correct the old usages of *-objs in Makefiles.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240507155540.24815-22-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # ROCKCHIP Platform Support
-snd-soc-rockchip-i2s-objs := rockchip_i2s.o
-snd-soc-rockchip-i2s-tdm-objs := rockchip_i2s_tdm.o
-snd-soc-rockchip-pdm-objs := rockchip_pdm.o
-snd-soc-rockchip-spdif-objs := rockchip_spdif.o
+snd-soc-rockchip-i2s-y := rockchip_i2s.o
+snd-soc-rockchip-i2s-tdm-y := rockchip_i2s_tdm.o
+snd-soc-rockchip-pdm-y := rockchip_pdm.o
+snd-soc-rockchip-spdif-y := rockchip_spdif.o
 
 obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_PDM) += snd-soc-rockchip-pdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S_TDM) += snd-soc-rockchip-i2s-tdm.o
 
-snd-soc-rockchip-max98090-objs := rockchip_max98090.o
-snd-soc-rockchip-rt5645-objs := rockchip_rt5645.o
-snd-soc-rk3288-hdmi-analog-objs := rk3288_hdmi_analog.o
-snd-soc-rk3399-gru-sound-objs := rk3399_gru_sound.o
+snd-soc-rockchip-max98090-y := rockchip_max98090.o
+snd-soc-rockchip-rt5645-y := rockchip_rt5645.o
+snd-soc-rk3288-hdmi-analog-y := rk3288_hdmi_analog.o
+snd-soc-rk3399-gru-sound-y := rk3399_gru_sound.o
 
 obj-$(CONFIG_SND_SOC_ROCKCHIP_MAX98090) += snd-soc-rockchip-max98090.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_RT5645) += snd-soc-rockchip-rt5645.o