ALSA: x86: fix spelling mistakes

Fix some spelling mistakes as follows:
regiter ==> register
confgiuration ==> configuration
playabck ==> playback
platoform ==> platform

Signed-off-by: gushengxian <gushengxian@yulong.com>
Link: https://lore.kernel.org/r/20210705073736.662875-1-gushengxian507419@gmail.com


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