dde_bsd: add patch to limit internal buffer size

Decreasing the internal buffer size will implicitly limit the number
of blocks provisioned for recording and brings them in line with
the number of blocks used for playback (2).

Note that this patch also sets an upper-bound on the number of
samples in 'Audio_*::PERIOD'.

repos/dde_bsd/patches/audio_bufsz.patch

@@ -0,0 +1,13 @@
+Decrease the initial audio buffer size that implicitly limits the number
+of records blocks.
+--- a/dev/audio.c
++++ b/dev/audio.c
+@@ -55,7 +55,7 @@
+ #define AUDIO_DEV(n)		(minor(n) & 0xf0)
+ #define AUDIO_DEV_AUDIO		0	/* minor of /dev/audio0 */
+ #define AUDIO_DEV_AUDIOCTL	0xc0	/* minor of /dev/audioctl */
+-#define AUDIO_BUFSZ		65536	/* buffer size in bytes */
++#define AUDIO_BUFSZ		4096	/* buffer size in bytes */
+ 
+ /*
+  * mixer entries added by the audio(4) layer

repos/dde_bsd/ports/dde_bsd.hash

@@ -1 +1 @@
-23a28150a282dd2d9f28e36264f1df5b0699ff6b
+b6086e021be26a2f2a07463c0318b79fd8d0513e