qcacld-3.0: Select transmit power as per 11.7.6 IEEE Section

Currently, if power constraint is advertised by AP then local
max tx power is calculated as per the rule defined in 9.4.2.13
(Power Constraint element) i.e regulatory power - local constraint
advertised by AP. As per the rule defined in 11.7.6
(Transmit power selection) transmit power for STA should be less
than or equal to the minimum of the local maximum transmit power
level and regulatory client maximum power.

Fix is instead of populating max_tx_power as diff of regulatory power
and derived local max tx power, populate max_tx_power to the MIN
of regulatory power and local max tx power to align with IEEE
standard.

Change-Id: I65fe4c9c6a4c7dd80540530c25b7ac2b1952633c
CRs-Fixed: 3740468

core/mac/src/pe/lim/lim_process_sme_req_messages.c

@@ -6306,9 +6306,11 @@ void lim_calculate_tpc(struct mac_context *mac,
 			} else {
 				max_tx_power = QDF_MIN(reg_max,
 						       local_constraint);
+				if (!max_tx_power)
+					max_tx_power = reg_max;
 			}
 		} else {
-			max_tx_power = reg_max - local_constraint;
+			max_tx_power = QDF_MIN(reg_max, local_constraint);
 			if (!max_tx_power)
 				max_tx_power = reg_max;
 		}