ASoC: pxa: 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/20240507155540.24815-20-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/pxa/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # PXA Platform Support
-snd-soc-pxa2xx-objs := pxa2xx-pcm.o
-snd-soc-pxa2xx-ac97-objs := pxa2xx-ac97.o
-snd-soc-pxa2xx-i2s-objs := pxa2xx-i2s.o
-snd-soc-pxa-ssp-objs := pxa-ssp.o
-snd-soc-mmp-sspa-objs := mmp-sspa.o
+snd-soc-pxa2xx-y := pxa2xx-pcm.o
+snd-soc-pxa2xx-ac97-y := pxa2xx-ac97.o
+snd-soc-pxa2xx-i2s-y := pxa2xx-i2s.o
+snd-soc-pxa-ssp-y := pxa-ssp.o
+snd-soc-mmp-sspa-y := mmp-sspa.o
 
 obj-$(CONFIG_SND_PXA2XX_SOC) += snd-soc-pxa2xx.o
 obj-$(CONFIG_SND_PXA2XX_SOC_AC97) += snd-soc-pxa2xx-ac97.o
@@ -13,5 +13,5 @@ obj-$(CONFIG_SND_PXA_SOC_SSP) += snd-soc-pxa-ssp.o
 obj-$(CONFIG_SND_MMP_SOC_SSPA) += snd-soc-mmp-sspa.o
 
 # PXA Machine Support
-snd-soc-spitz-objs := spitz.o
+snd-soc-spitz-y := spitz.o
 obj-$(CONFIG_SND_PXA2XX_SOC_SPITZ) += snd-soc-spitz.o