qcacmn: Add mcs, gI & sig info to cfr metadata

Add mcs rate, gI type and other SU sig info to cfr metadata.
For Tx based capture mcs rate & gI type is applicable
MCS For legacy mode
      0: 48 Mbps
      1: 24 Mbps
      2: 12 Mbps
      3: 6 Mbps
      4: 54 Mbps
      5: 36 Mbps
      6: 18 Mbps
      7: 9 Mbps
      8: invalid entry
MCS for HT, 0-7: MCS0-MCS7,
MCS for VHT, 0-9: MCS0-MCS9,
MCS for HE, 0-11 MCS0-MCS11, 12-13: 4096QAM
GI:
     0: 0.8 us
     1: 0.4 us
     2: 1.6 us
     3: 3.2 us
ltf_size:
     0: he_ltf_1_x
     1: he_ltf_2_x
     2: he_ltf_4_x
dcm: Indicates if DCM set
     0: No DCM
     1: DCM
sgi: Indicates if short gI used
     0: No short gI
     1: short gI
beamformed: Is packet beamformed
     0: non-beamformed
     1: beamformed
stbc: Indicates if stbc applied
     0: No STBC
     1: STBC
Coding:
     0: BCC
     1: LDPC

Change-Id: If6ab4b4878ab24406aba0e890ec08a2dae2b4634