power: axp818: Fix typo for fldo2 Kconfig description

Description said eldo2 instead of fldo2, a copy-paste error.

Fixes: 38491d9c ("power: axp818: Add support for FLDOs")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>