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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