ALSA: Make SND_PCMTEST depend on DEBUG_FS

Since pcmtest is a test module that manipulates or gets
notification via debugfs, without DEBUG_FS it can not work fine.
So make SND_PCMTEST depend on DEBUG_FS.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Acked-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Link: https://lore.kernel.org/r/20230817093740.1732738-1-ruanjinjie@huawei.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/Kconfig

@@ -111,6 +111,7 @@ config SND_ALOOP
 
 config SND_PCMTEST
 	tristate "Virtual PCM test driver"
+	depends on DEBUG_FS
 	select SND_PCM
 	help
 	  Say 'Y' or 'M' to include support for the Virtual PCM test driver.