Support other audio sample rates than 48000 Hz from bmusb.

[nageru] / bmusb

diff --git a/bmusb b/bmusb
index c245ceb9081e412bb815480481670e295ddfc71a..b70e557a8432ca3d86c1a71837e7a10e7935d585 160000 (submodule)
--- a/bmusb
+++ b/bmusb
@@ -1 +1 @@
-Subproject commit c245ceb9081e412bb815480481670e295ddfc71a
+Subproject commit b70e557a8432ca3d86c1a71837e7a10e7935d585