ASoC: ux500: 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/20240507155540.24815-33-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/ux500/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # Ux500 Platform Support
 
-snd-soc-ux500-plat-msp-i2s-objs := ux500_msp_dai.o ux500_msp_i2s.o
+snd-soc-ux500-plat-msp-i2s-y := ux500_msp_dai.o ux500_msp_i2s.o
 obj-$(CONFIG_SND_SOC_UX500_PLAT_MSP_I2S) += snd-soc-ux500-plat-msp-i2s.o
 
-snd-soc-ux500-plat-dma-objs := ux500_pcm.o
+snd-soc-ux500-plat-dma-y := ux500_pcm.o
 obj-$(CONFIG_SND_SOC_UX500_PLAT_DMA) += snd-soc-ux500-plat-dma.o
 
-snd-soc-ux500-mach-mop500-objs := mop500.o mop500_ab8500.o
+snd-soc-ux500-mach-mop500-y := mop500.o mop500_ab8500.o
 obj-$(CONFIG_SND_SOC_UX500_MACH_MOP500) += snd-soc-ux500-mach-mop500.o