build: Add meson build for phosphor-host-ipmi

Create meson and meson_options for the existing features.

Removed sample.h/cpp since that is not used at all.

Tested:
Ipmi command works fine the clea

build: Add meson build for phosphor-host-ipmi

Create meson and meson_options for the existing features.

Removed sample.h/cpp since that is not used at all.

Tested:
Ipmi command works fine the cleanup.
```
$ systemctl status phosphor-ipmi-host
● phosphor-ipmi-host.service - Phosphor Inband IPMI
Loaded: loaded (/lib/systemd/system/phosphor-ipmi-host.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 1970-01-08 21:20:56 UTC; 21s ago
Main PID: 24987 (ipmid)
CGroup: /system.slice/phosphor-ipmi-host.service
└─24987 /tmp/ipmid

Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X32] for Sys Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: I2C_WHITELIST_CHECK is disabled, do not populate whitelist
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X04] for Manual Zone Control
Jan 08 21:20:56 $HOST systemd[1]: Started Phosphor Inband IPMI.
Jan 08 21:20:56 $HOST ipmid[24987]: Loading whitelist filter
Jan 08 21:20:56 $HOST ipmid[24987]: Set restrictedMode = true
(reverse-i-search)`ipmi': systemctl status phosphor-^Cmi-host

$ ipmitool mc info
Device ID : 32
Device Revision : 1
Firmware Revision : 0.00
IPMI Version : 2.0
Manufacturer ID : 7244
Manufacturer Name : Quanta Computer Inc.
Product ID : 14426 (0x385a)
Product Name : Unknown (0x385A)
Device Available : yes
Provides Device SDRs : yes
Additional Device Support :
Sensor Device
SEL Device
FRU Inventory Device
Chassis Device
Aux Firmware Rev Info :
0x00
0x00
0x00
0x00
```

Change-Id: Ibaea9eea802b063a0207320654cbb817fde30c2a
Signed-off-by: Willy Tu <wltu@google.com>

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