configs/galileo: grub2 needs wchar toolchain
The galileo_defconfig has the line "BR_TARGET_GRUB2=y", but this
currently has no effect because BR_TARGET_GRUB2 cannot be selected
without BR2_TOOLCHAIN_BUILDROOT_WCHAR=y, which is not set by default.
Signed-off-by: Nicholas Sielicki <sielicki@yandex.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>