ASoC: loongson: 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/20240507155540.24815-16-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/loongson/Makefile

 # SPDX-License-Identifier: GPL-2.0
 #Platform Support
-snd-soc-loongson-i2s-pci-objs := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
+snd-soc-loongson-i2s-pci-y := loongson_i2s_pci.o loongson_i2s.o loongson_dma.o
 obj-$(CONFIG_SND_SOC_LOONGSON_I2S_PCI) += snd-soc-loongson-i2s-pci.o
 
 #Machine Support
-snd-soc-loongson-card-objs := loongson_card.o
+snd-soc-loongson-card-y := loongson_card.o
 obj-$(CONFIG_SND_SOC_LOONGSON_CARD) += snd-soc-loongson-card.o