As part of 802.11be_D4.1 new param Ext Max Tx power is added
in TPE for 320 MHz and while packing the TPE IE in beacon frame
max tx power will be calculated based on max_tx_pwr_interpret.
And max_tx_pwr_interpret is filled irrespective of channel bandwidth
which leads to TPE IE length more than 9 for legacy case also.
Pack tpe ie manually to consider max_tx_pwr_interpret to calculate
tx power only for 320 MHz and legacy method for less than 320 MHz.
CRs-Fixed: 3750566
Change-Id: Ibacb634c24d08886ccf2848a8dc8e2ecdf6b247a