configs/galileo_defconfig: add missing double quotes around BR2_GLOBAL_PATCH_DIR value
This bogus BR2_GLOBAL_PATCH_DIR value was added in commit
9dd5382d791c3d5197b9ef401a0d103ad1457d5d ("board/intel/galileo: fix
build failure with host gcc 10") back in February.
This should help fixing
https://gitlab.com/buildroot.org/buildroot/-/jobs/2781800667, as it
complains with:
WARN: defconfig ./configs/galileo_defconfig can't be used:
Missing: BR2_GLOBAL_PATCH_DIR=board/intel/galileo/patches
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>