qcacmn: Update regulatory to use bitmap for band

Setband changes require support for 6G band. Using a bitmap
better supports the addition of new bands. Changes to support
this include:
	1. Update band_capability in regulatory pdev priv obj
	   to be a bitmap.
	2. Add API to convert between the bitmap and
	   enum band_info.
	3. Update channel list modifying function to include
	   case for 6G band.
	4. Update the get and set APIs to use uint32_t instead
	   of band_info.

Change-Id: Iff38fdd7cc540a0e471647de349d7fa57b3a8467
CRs-fixed: 2726285