linux/common-config: enable RT1308 sound support module

This module is required for working internal speakers on **some** versions of the Dell XPS 9700, possibly
other laptops.

Upstreaming it removes the need for kernel rebuilds for these laptop
users.

See #130882

pkgs/os-specific/linux/kernel/common-config.nix

@@ -513,6 +513,7 @@ let
                         versionAtLeast version "5.5") {
       SND_SOC_INTEL_SOUNDWIRE_SOF_MACH       = whenAtLeast "5.10" module;
       SND_SOC_INTEL_USER_FRIENDLY_LONG_NAMES = whenAtLeast "5.10" yes; # dep of SOF_MACH
+      SND_SOC_RT1308                         = whenAtLeast "5.12" module; # Realtek RT1308 codec
       SND_SOC_SOF_INTEL_SOUNDWIRE_LINK = whenBetween "5.10" "5.11" yes; # dep of SOF_MACH
       SND_SOC_SOF_TOPLEVEL              = yes;
       SND_SOC_SOF_ACPI                  = module;