ASoC: apple: 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/20240507155540.24815-6-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/apple/Makefile

-snd-soc-apple-mca-objs	:= mca.o
+snd-soc-apple-mca-y	:= mca.o
 
 obj-$(CONFIG_SND_SOC_APPLE_MCA)	+= snd-soc-apple-mca.o