NTB: MFV 2f887b9a: Rename Intel code names to platform names

Mechanically replace "SOC" with "ATOM" to match Linux. No functional
change. Original Linux commit log follows:

Instead of using the platform code names, use the correct platform names
to identify the respective Intel NTB hardware.

Authored by: Dave Jiang
Obtained from: Linux (Dual BSD/GPL driver)
Sponsored by: EMC / Isilon Storage Division