meson: remove deprecated get_pkgconfig_variable

Since meson 0.56, the `get_pkgconfig_variable` has been deprecated. In
meson 0.58 the `get_variable` was enhanced to no longer require the
`pkgconfig

meson: remove deprecated get_pkgconfig_variable

Since meson 0.56, the `get_pkgconfig_variable` has been deprecated. In
meson 0.58 the `get_variable` was enhanced to no longer require the
`pkgconfig` keyword argument. Ensure meson 0.58 is required and update
the usage of all `get_pkgconfig_variable` and `get_variable` to be the
modern variant.

Change-Id: I9d6c273f740a62fdbea64cb29ae6db29b8af19da
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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build: Remove unused phosphor-logging dependency

Change-Id: I4f4e5efc998ed9738a548a353a6bd315ebe5f47c
Signed-off-by: William A. Kennington III <wak@google.com>

build: Add meson build

Changes to note,
- `with_systemdsystemunitdir` and `with_tmpfilesdir` is removed since it
is not being documented nor used in OpenBMC.
- Removed the Code

build: Add meson build

Changes to note,
- `with_systemdsystemunitdir` and `with_tmpfilesdir` is removed since it
is not being documented nor used in OpenBMC.
- Removed the Code coverage feature with `-DDHAVE_GCOV`, since it is not
used and meson covers it.
- Removed `--enable-oe-sdk` for using the OpenBMC SDK. It should work
directly with no change required.

Tested:
```
Jan 01 00:01:54 ipmid[709]: Try loading blob from persistent data
Jan 01 00:01:54 ipmid[709]: Stale blob data, resetting internals...
Jan 01 00:01:56 ipmid[709]: config loaded: /flash/bios
Jan 01 00:01:56 ipmid[709]: config loaded: /flash/image
Jan 01 00:01:56 ipmid[709]: config loaded: /flash/dummy
...
```

```
$ ls /usr/lib/blob-ipmid/
libfirmwareblob.so
libfirmwarecleanupblob.so libversionblob.so
```

Testing the service,
```
$ echo "hello" > /tmp/test.txt
$ burn_my_bmc -command update -layout dummy -image /tmp/test.txt
Sending over the firmware image.
Opening the verification file
Committing to /flash/verify to trigger service
Calling stat on /flash/verify session to check status
running
success
Returned success
succeeded
```

On the BMC.
```
/run/initramfs$ cat dummy
hello
```

Change-Id: I21c7c33bd62c0ee40681cb40da90125c125bea2f
Signed-off-by: Willy Tu <wltu@google.com>

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