ASoC: xtensa: 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/20240507155540.24815-35-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: tiwai

sound/soc/xtensa/Makefile

@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
-snd-soc-xtfpga-i2s-objs := xtfpga-i2s.o
+snd-soc-xtfpga-i2s-y := xtfpga-i2s.o
 
 obj-$(CONFIG_SND_SOC_XTFPGA_I2S) += snd-soc-xtfpga-i2s.o