Disable floppy driver in Linux configuration

[pmenzel]

On orpheus (Supermicro X10DAi) Linux wastes 1.4 seconds detecting the floppy controller. On pummeluff it is less noticeable with 0.6 s.

• orpheus:

  [   22.976177] hub 2-1:1.0: 8 ports detected
  [   24.381155] floppy0: no floppy controllers found
  [   24.382112] scsi 0:0:0:0: Direct-Access     ATA      SAMSUNG MZ7KM960 003Q PQ: 0 ANSI: 5
  

• pummeluff:

  [    3.853763] hid-generic 0003:0BF8:101E.0003: input,hidraw2: USB HID v1.10 Device [Fujitsu Fujitsu Keyboard] on usb-0000:00:14.0-11/input1
  [    4.465044] floppy0: no floppy controllers found
  

None of our systems have a floppy drive, so we should not build it into the Linux kernel.

$ grep BLK_DEV_FD /boot/config-4.19.40.mx64.262 
CONFIG_BLK_DEV_FD=y

Maybe it should be built as a module, in case a virtual machines get configured with a floppy controller.

So, when building the next Linux kernel, change the configuration.

[pmenzel]

Tested with Linux 5.1.1 with the driver built as module.

[donald]

Keep it open until the change is in our default kernel, so that next 4.19 builder (might) remember it?