ALSA: hda: Move CONFIG_SND_HDA_PREALLOC_SIZE into sound/hda/common

CONFIG_SND_HDA_PREALLOC_SIZE is used only by controller.c in
sound/hda/common, hence it depends on CONFIG_SND_HDA.

Move the definition to the right place inside SND_HDA if/endif block
in sound/hda/common/Kconfig.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250709160434.1859-5-tiwai@suse.de