Change efifb workaround method

That method lets us use the unpatched NixOS kernel freely! yay!

README.md

@@ -29,11 +29,11 @@ What's untested and not working will be listed here at some point. Maybe.
 
 #### `rockchipdrm` and `efifb`
 
-`CONFIG_FB_EFI` has been disabled in the customized kernel as `rockchipdrm`
-will not render the VT if `efifb` is present.
+This can be worked around by booting with the `efifb=off` kernel command-line.
 
-Be careful if using the mainline kernel instead, as it will have
-`CONFIG_FB_EFI` set to `y`.
+This is already handled for you by this configuration. If using the generic
+UEFI AArch64 iso, you will need to add the option yourself to the command-line
+using GRUB.
 
 #### *EFI* and poweroff
 

kernel/latest/default.nix

@@ -46,14 +46,6 @@ linux_latest.override({
         VIDEO_HANTRO_ROCKCHIP y
       '';
     }
-    {
-      # When efifb is used, rockchipdrm won't render the VT.
-      name = "rk3399-efifb-config";
-      patch = null;
-      extraConfig = ''
-        FB_EFI n
-      '';
-    }
 
     # Misc. community patches
     # None are *required* for basic function.

kernel/lts/default.nix

@@ -46,14 +46,6 @@ linux_5_10.override({
         VIDEO_HANTRO_ROCKCHIP y
       '';
     }
-    {
-      # When efifb is used, rockchipdrm won't render the VT.
-      name = "rk3399-efifb-config";
-      patch = null;
-      extraConfig = ''
-        FB_EFI n
-      '';
-    }
 
     # Misc. community patches
     # None are *required* for basic function.

pinebook_pro.nix

@@ -41,6 +41,11 @@
     "rtc_rk808"
   ];
 
+  boot.kernelParams = [
+    # Works around an issue with efifb, U-Boot and RK3399
+    "efifb=off"
+  ];
+
   services.udev.extraHwdb = lib.concatStrings [
     # https://gitlab.manjaro.org/manjaro-arm/packages/community/pinebookpro-post-install/blob/master/10-usb-kbd.hwdb
     ''