This mispelling was present in the configuration, so I retained parsing
of the legacy BandModifier*Ghz options for compatibility. Without this
change anyone spelling GHz correctly in their configs would be very
confused.
The 6GHz test was not incrementing the frequencies properly which
was resulting in invalid frequencies, but since the conversion
API was never linked to E-4 the test was still passing.
In test-band the band object was allocated using l_malloc, but not
memset to zero. This will cause problems if allocated pointers are
included in struct band once band is freed.
