s390/configs: remove useless UEVENT_HELPER_PATH

Remove the CONFIG_UEVENT_HELPER_PATH because:
1. It is disabled since commit 1be01d4a ("driver: base: Disable
   CONFIG_UEVENT_HELPER by default") as its dependency (UEVENT_HELPER) was
   made default to 'n',
2. It is not recommended (help message: "This should not be used today
   [...] creates a high system load") and was kept only for ancient
   userland,
3. Certain userland specifically requests it to be disabled (systemd
   README: "Legacy hotplug slows down the system and confuses udev").
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

arch/s390/configs/defconfig

@@ -94,7 +94,6 @@ CONFIG_NET_CLS_RSVP6=m
 CONFIG_NET_CLS_ACT=y
 CONFIG_NET_ACT_POLICE=y
 CONFIG_BPF_JIT=y
-CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
 CONFIG_DEVTMPFS=y
 CONFIG_BLK_DEV_LOOP=m
 CONFIG_BLK_DEV_NBD=m

arch/s390/configs/zfcpdump_defconfig

@@ -24,7 +24,6 @@ CONFIG_CRASH_DUMP=y
 # CONFIG_SECCOMP is not set
 CONFIG_NET=y
 # CONFIG_IUCV is not set
-CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
 CONFIG_DEVTMPFS=y
 CONFIG_BLK_DEV_RAM=y
 # CONFIG_BLK_DEV_XPRAM is not set