phosphor-usb-code-update: move to libexec

Non-user executables are suppose to be installed into libexec[1].

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#incorrect-placement-of-

phosphor-usb-code-update: move to libexec

Non-user executables are suppose to be installed into libexec[1].

[1]: https://github.com/openbmc/docs/blob/master/anti-patterns.md#incorrect-placement-of-executables-in-sbin-usrsbin-or-bin-usrbin

Tested:

```
$ meson install -C builddir --destdir /tmp/phosphor-bmc-code-mgmt
$ find /tmp/phosphor-bmc-code-mgmt/ -name phosphor-usb-code-update
/tmp/phosphor-bmc-code-mgmt/usr/local/libexec/phosphor-bmc-code-mgmt/phosphor-usb-code-update
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I59925038785709c3bfb2e374c4a233e2cd9d9176

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re-organize the current files into bmc directory

More daemons are being developed in phosphor-bmc-code-mgmt repo as part
of https://github.com/openbmc/docs/blob/master/designs/code-update.md.
For th

re-organize the current files into bmc directory

More daemons are being developed in phosphor-bmc-code-mgmt repo as part
of https://github.com/openbmc/docs/blob/master/designs/code-update.md.
For this move the current files for BMC code update into bmc
subdirectory for a better code organization.

Tested:
meson build passes.

Change-Id: I7b5575bcfbe54ac00aa803f94b5d8f6d69ce2f3f
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>

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