meta-ampere: fix parameters in power control services

When HOST is turned on/off, ampere-gpio-poweroff/on@.service is called.
They should not call op-wait-power-off/on@.service, just wait for them.
Remove redundant "Requires" and "Wants" in service files.

Add timeout to obmc-flash-host-bios@.service to avoid blocking power
control.

Tested:
      1. Turn on/off the HOST power.
      2. Check journalctl log to ensure that op-wait-power-off/on@.service
         are not called by ampere-gpio-poweroff/on@.service.

Signed-off-by: Thang Tran <thuutran@amperecomputing.com>
Change-Id: If9403891b2e57c73c4fd8e0ea1b24314b7b0c3f8
diff --git a/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere-gpio-poweroff@.service b/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere-gpio-poweroff@.service
index fe776a5..ce59894 100644
--- a/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere-gpio-poweroff@.service
+++ b/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere-gpio-poweroff@.service
@@ -1,7 +1,6 @@
 [Unit]
 Description=Ampere set GPIOs before power off
-Requires=op-wait-power-off@%i.service
-After=op-wait-power-off@%i.service
+Before=op-wait-power-off@%i.service
 Conflicts=obmc-chassis-poweron@%i.target
 
 [Service]