configs/galileo: remove defconfig, broken

This defconfig no longer builds:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/11012273310

It started to break not long ago, about 1 month ago, most likely due a
toolchain update:

  https://gitlab.com/buildroot.org/buildroot/-/jobs?name=T%3Dgalileo&kind=BUILD

However, it is build a very old 3.14, which is anyway unmaintained,
and issues with newer toolchains are going to get worse and worse.

Unless a fix is provided, this defconfig is going to be removed.

Cc: Nicholas Sielicki <sielicki@yandex.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>
(cherry picked from commit ce76a11630)
Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>

DEVELOPERS

@@ -2472,10 +2472,6 @@ F:	toolchain/toolchain-bare-metal-buildroot/
 N:	Nicola Di Lieto <nicola.dilieto@gmail.com>
 F:	package/uacme/
 
-N:	Nicholas Sielicki <sielicki@yandex.com>
-F:	board/intel/galileo/
-F:	configs/galileo_defconfig
-
 N:	Nicolas Carrier <nicolas.carrier@orolia.com>
 F:	package/bmap-tools/
 F:	package/composer/