ASoC: uniphier: 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/20240507155540.24815-32-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/uniphier/Makefile

 # SPDX-License-Identifier: GPL-2.0
-snd-soc-uniphier-aio-cpu-objs := aio-core.o aio-dma.o aio-cpu.o aio-compress.o
-snd-soc-uniphier-aio-ld11-objs := aio-ld11.o
-snd-soc-uniphier-aio-pxs2-objs := aio-pxs2.o
+snd-soc-uniphier-aio-cpu-y := aio-core.o aio-dma.o aio-cpu.o aio-compress.o
+snd-soc-uniphier-aio-ld11-y := aio-ld11.o
+snd-soc-uniphier-aio-pxs2-y := aio-pxs2.o
 
 obj-$(CONFIG_SND_SOC_UNIPHIER_AIO) += snd-soc-uniphier-aio-cpu.o
 obj-$(CONFIG_SND_SOC_UNIPHIER_LD11) += snd-soc-uniphier-aio-ld11.o
 obj-$(CONFIG_SND_SOC_UNIPHIER_PXS2) += snd-soc-uniphier-aio-pxs2.o
 
-snd-soc-uniphier-evea-objs := evea.o
+snd-soc-uniphier-evea-y := evea.o
 obj-$(CONFIG_SND_SOC_UNIPHIER_EVEA_CODEC) += snd-soc-uniphier-evea.o