The rtc-lib dependency is not required, and seems it was just
copy-pasted from ARM's Kconfig. If platform requires rtc-lib,
they should select it individually.
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: NWill Deacon <will.deacon@arm.com>