Spectral scan period is not in terms of tclk periods for
generation 3 Spectral HW. It is directly in micro seconds.
Default value is 224 us. Driver needs to use 224 us as
default value. Application needs to display the unit as
tclk period till generation II and micro second for
generation III. For this driver will be sharing the
Spectral HW generation info to application as part of
the capability exchange.
CRs-Fixed: 2225740
Change-Id: Iaeda8ebb77c2a39824b5f919e8578ff4d56c1aa5
df3100c157