Add "dis_ucode_ldr" to linux boot options for Recovery Mode

[Jeroen Bobbeldijk]

Hi,

Due to some recent problems with a microcode update which broke booting of
some laptops I suggest adding "dis_ucode_ldr" to recovery mode boot options
to allow booting after a bad microcode update.

See the following topics that describe the problems:
 - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829620
 -
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/1

When such problems occur it's very hard to see that the microcode loading
is the issue, the booting just hangs at the purple screen, even removing
"quiet splash" will not show the error.

Kind regards,

Jeroen
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