[WCNCR00151635] misc: Add iwpriv command to get Tx rate from rate table

[Description]
Add iwpriv command 'driver get_curr_ar_rate', which will return current
Tx rate being used in the AR rate table.

Command example:
	iwpriv wlan0 driver get_curr_ar_rate
Output example:
	VHT-2SS-BW80-SGI-MCS11

Feature: misc
Change-Id: I1937aa0e036b75219f2720d2647f71d20f395da7
Signed-off-by: Sarick Jiang <sarick.jiang@mediatek.com>
CR-Id: WCNCR00151635
1 file changed