devices: fix wrong gain to power mapping

The dev type was set too early, but the actual dev is only being
discovered during open, so update it. This broke the gain to power
mapping by defaulting to a wrong device.

Change-Id: I1dda6023ca6f15bc063c3dfbc704db2410ff7c98

Transceiver52M/device/bladerf/bladerf.cpp

@@ -279,6 +279,7 @@ int blade_device::open()
 
 	dev_type = blade_dev_type::BLADE2;
 	tx_window = TX_WINDOW_FIXED;
+	update_band_dev(dev_key(dev_type, tx_sps, rx_sps));
 
 	struct bladerf_devinfo info;
 	bladerf_get_devinfo(dev, &info);

Transceiver52M/device/common/bandmanager.h

@@ -34,7 +34,7 @@ class band_manager {
 	using powerkeyt = typename powermapt::key_type;
 	using powermappedt = typename powermapt::mapped_type;
 	using devkeyt = typename devmapt::key_type;
-	const devkeyt &m_dev_type;
+	devkeyt m_dev_type;
 	const powermapt &m_power_map;
 	const devmapt &m_dev_map;
 	powerkeyt m_fallback;
@@ -102,6 +102,10 @@ class band_manager {
 		band_ass_curr_sess = false;
 	}
 
+	void update_band_dev(devkeyt dev_type) {
+		m_dev_type = dev_type;
+	}
+
 	void get_dev_band_desc(powermappedt &desc)
 	{
 		if (m_band == 0) {

Transceiver52M/device/lms/LMSDevice.cpp

@@ -245,6 +245,7 @@ int LMSDevice::open()
 
 	m_dev_type = parse_dev_type(m_lms_dev);
 	dev_desc = dev_param_map.at(m_dev_type);
+	update_band_dev(m_dev_type);
 
 	if ((cfg->clock_ref != REF_EXTERNAL) && (cfg->clock_ref != REF_INTERNAL)) {
 		LOGC(DDEV, ERROR) << "Invalid reference type";

Transceiver52M/device/uhd/UHDDevice.cpp

@@ -530,6 +530,8 @@ int uhd_device::open()
 	if (!parse_dev_type())
 		return -1;
 
+	update_band_dev(dev_key(dev_type, tx_sps, rx_sps));
+
 	if ((dev_type == E3XX) && !uhd_e3xx_version_chk()) {
 		LOGC(DDEV, ALERT) << "E3XX requires UHD 003.009.000 or greater";
 		return -1;