meta-evb-fvp-base: SOL support

This commit enables host serial console access in base fvp (BMC).
In BMC, UART3(ttyAMA3) is mapped for SOL access.

Testing:

1. Verified using RD-V3-R1 FVP + Base FVP (running OpenBMC firmware)

2. Connect host console with BMC via socat command
   > socat -x tcp:localhost:5005 tcp:localhost:5067

3. Update the host state as running in BMC in debug console
   > busctl set-property xyz.openbmc_project.State.Host
     /xyz/openbmc_project/state/host0 xyz.openbmc_project.State.Host
     CurrentHostState s
     xyz.openbmc_project.State.Host.HostState.Running

4. Log-in to BMC webui via https://127.0.0.1:4223


5. Accesss SOL console from Overview page

Change-Id: I5d797b2b6f57a16d5b53f32c8aa422d102b55c56
Signed-off-by: Mohammed Javith Akthar M <mohammedjavitham@ami.com>