phosphor-ipmi-flash: Code Health Cleanup

Removed the following warning.
- using decl '*' is unused
- 'push_back' is called inside a loop; consider pre-allocating the
container capacity before th

phosphor-ipmi-flash: Code Health Cleanup

Removed the following warning.
- using decl '*' is unused
- 'push_back' is called inside a loop; consider pre-allocating the
container capacity before the loop
- function '*' defined in a header file; function
definitions in header files can lead to ODR violations

Change-Id: I44e4b0f8056a853fb45b690394be1a8ebec45b20
Signed-off-by: Willy Tu <wltu@google.com>

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