meta-amd: Change unit type of 'ip-to-fpga.service'

Currently with the 'oneshot' unit type the 'ip-to-fpga.service' is
always in the 'running' state:
```
root@ethanolx:~# systemctl list-jobs
JOB UNIT                                    TYPE  STATE
88  obmc-led-group-start@bmc_booted.service start waiting
1   multi-user.target                       start waiting
126 ip-to-fpga.service                      start running

3 jobs listed.
```
This creates a problem since 'srvcfg-manager' service expects every
startup job to finish.
Change unit type to 'simple' to fix the issue.

Change-Id: I45840ef432ce33be400b547420ab5ceeca949ba0
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
diff --git a/meta-amd/recipes-amd/amd-fpga/files/ip-to-fpga.service b/meta-amd/recipes-amd/amd-fpga/files/ip-to-fpga.service
index 18fbca8..2d12c68 100644
--- a/meta-amd/recipes-amd/amd-fpga/files/ip-to-fpga.service
+++ b/meta-amd/recipes-amd/amd-fpga/files/ip-to-fpga.service
@@ -4,7 +4,7 @@
 After=sys-subsystem-net-devices-eth0.device
 
 [Service]
-Type=oneshot
+Type=simple
 ExecStart=/usr/bin/ip-to-fpga.sh
 
 [Install]