Add/Fix command-line checks for smbios options v2

- One type 4 table is required per cpu. Add a check for this.
- Fix check for smbios file.

Changes from v1:
- static designation of smbios_validate_table, and remove whitespace

Signed-off-by: Beth Kon <eak@us.ibm.com>
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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