LP PHY Set TX Filter BW (u16 bw)

1. If PHY Revision >= 2

   1. MaskSet PHY Register 0x4EA with mask 0xFFF8 and set with bw

   2. MaskSet PHY Register 0x4EB with mask 0xFFF8 and set with bw

   3. If bw <= 1

      1. Set tmp to 0x0E

   4. Else if bw <= 3

      1. Set tmp to 0x13
   5. Otherwise
      1. Set tmp to 0x1B

   6. MaskSet Radio Register 0x119 with mask 0xFFE0 and set with tmp