kernel: Fix rtc-ds1307 dependency on hwmon-core for 4.19
It seems, that since Linux 4.18-rc1 rtc-ds1307 depends on hwmon-core.
commit
6b583a64fd1e019fd01626b46892ebf2361951c5
Author: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed Sep 27 22:41:26 2017 +0200
rtc: ds1307: simplify hwmon config
We don't have to define an extra config symbol, IS_REACHABLE does
what we need. And having this config symbol just to save the few
bytes of hwmon support on non-DS3231 chips isn't worth it IMO
(especially as the symbol is set per default).
While at it, use the same dependency check for `kmod-regmap` as well, so
it's future proof as well.
Signed-off-by: Petr Štetiar <ynezz@true.cz>