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

Signed-off-by: Takashi Iwai <tiwai@suse.de>
*-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.

Link: https://lore.kernel.org/r/20240507155540.24815-4-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/adi/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-snd-soc-adi-axi-i2s-objs := axi-i2s.o
-snd-soc-adi-axi-spdif-objs := axi-spdif.o
+snd-soc-adi-axi-i2s-y := axi-i2s.o
+snd-soc-adi-axi-spdif-y := axi-spdif.o
 
 obj-$(CONFIG_SND_SOC_ADI_AXI_I2S) += snd-soc-adi-axi-i2s.o
 obj-$(CONFIG_SND_SOC_ADI_AXI_SPDIF) += snd-soc-adi-axi-spdif.o