linuxPackages.{imx258,rt5640}: prefix name with "megi-"

to differentiate with other (future) customized versions of these modules

hosts/modules/hal/pine64-pinephone-pro/default.nix

@@ -196,12 +196,12 @@ in
       config.boot.kernelPackages.rk818-charger  #< rk818 battery/charger isn't mainline as of 2024-10-01
       #v XXX(???? - 2025-07-18): mainline imx258 camera driver has some power-on issues on PPP  (imx258 1-001a: Error reading reg 0x0016: -6)
       #v XXX(2025-07-18): megi's imx258 breaks mainline audio, though
-      # config.boot.kernelPackages.imx258
+      # config.boot.kernelPackages.megi-imx258
       #v optionally use megi's rt5640 sound driver;
       #v XXX(2025-07-18): when using megi's imx258, the mainline rt5640 driver errors: `rt5640: 1-001c: ASoC error (-22): at snd_soc_dai_set_sysclk() on rt5640-aif1`
       #v                  prior to this mainline driver was working fine, alongside camera/imx258, for half a year.
       #v                  although this fixes the dmesg errors, it causes pipewire/wireplumber to crash-loop.
-      # config.boot.kernelPackages.rt5640
+      # config.boot.kernelPackages.megi-rt5640
     ];
 
     # default nixos behavior is to error if a kernel module is provided by more than one package.

pkgs/linux-packages/megi-imx258/package.nix

@@ -12,7 +12,7 @@
 }:
 
 stdenv.mkDerivation {
-  pname = "imx258";
+  pname = "megi-imx258";
   version = "0-unstable-2024-09-15";
 
   src = ./.;

pkgs/linux-packages/megi-rt5640/package.nix

@@ -13,7 +13,7 @@
 }:
 
 stdenv.mkDerivation {
-  pname = "rt5640";
+  pname = "megi-rt5640";
   version = "0-unstable-2024-02-21";
 
   src = ./.;