linux-next: enable USB_SND_CARD

I'd like to use my USB audio interface with my laptop!

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>
Part-of: !6343
[ci:skip-build]: already built successfully in CI

device/testing/linux-next/APKBUILD

@@ -3,7 +3,7 @@
 
 pkgname=linux-next
 pkgver=6.14_git20250321
-pkgrel=0
+pkgrel=1
 _nextver="${pkgver#*_git}"
 pkgdesc="Linux next kernel"
 arch="aarch64"
@@ -71,5 +71,5 @@ package() {
 sha512sums="
 36f31788390660c4ded5cf34eed08378460b649929de2e51d2bd29c710ca9a5bbed4592dcb38ac75c750e83a4195c0813eb848688a2c5db6fb040065d1097582  linux-next-next-20250321.tar.gz
 95b1da5657af138ef97022c9f64987e765bfee634f8b967530dc7126f664039984dc2c2d20abb131fc119794fed25394b235bfc0c18390a45fd782bbaab63dba  devices.config
-d71b52f95c94aeed420704150965b4a084038d7db4dce14f9d4eeb1d5a6a7505ab34eb5245a05bf0186e68a6c41d719c40dbd0050ebb9fb7b769dfe118a7a89f  pmos.config
+8ceb3e5904c6d860b7b516c4313610a2ac80b89cb64a8b5b2993561f50c53ba087408b1c6b3108a2e51af4775630a2526ff678704be13eb282df9e5d9f97ccfd  pmos.config
 "

device/testing/linux-next/pmos.config

@@ -197,6 +197,9 @@ CONFIG_USB_G_SERIAL=n
 CONFIG_USB_CONFIGFS_NCM=y
 CONFIG_USB_CONFIGFS_RNDIS=y
 
+# Enable USB sound cards
+CONFIG_SND_USB_AUDIO=m
+
 # other
 CONFIG_BLK_DEV_NBD=y # netboot
 CONFIG_INPUT_UINPUT=m # fbkeyboard, buffyboard