qcacmn: Clamp the FFT bin values before filling SAMP message

Each FFT bin value is represented as an 8 bit integer
in SAMP message. But depending on the configuration,
the FFT bin value reported by HW might exceed 8 bits.
Clamp the FFT bin value between the min and max value
which can be represented by 8 bits. For linear mode,
min and max FFT bin value which can be represented by
8 bit is 0 and U8_MAX respectively. For dBm mode,  min
and max FFT bin value which can be represented by 8 bit
is S8_MIN and S8_MAX respectively.

CRs-Fixed: 3056458
Change-Id: I9ec75f781a130d3ed0d0d9393975fd5874961ce0

spectral/dispatcher/inc/spectral_ioctl.h

@@ -117,6 +117,16 @@ enum spectral_report_mode {
 	SPECTRAL_REPORT_MODE_MAX,
 };
 
+/**
+ * enum spectral_pwr_format: Spectral FFT bin pwr format
+ * @SPECTRAL_PWR_FORMAT_LINEAR: Linear mode
+ * @SPECTRAL_PWR_FORMAT_DBM: dBm mode
+ */
+enum spectral_pwr_format {
+	SPECTRAL_PWR_FORMAT_LINEAR = 0,
+	SPECTRAL_PWR_FORMAT_DBM = 1,
+};
+
 /**
  * enum spectral_scan_priority: Spectral scan priority
  * @SPECTRAL_SCAN_PRIORITY_LOW: Low priority Spectral scan