qcacmn: Check agile frequency forms a valid 80+80 channel

For agile scan request in 80 + 80 MHz check whether the user given
agile frequency forms a valid 80+80 channel.

CRs-Fixed: 2690964
Change-Id: Ia374333118d4f06861a1cfe0a75db349bca9e879

target_if/spectral/target_if_spectral.h

@@ -44,6 +44,7 @@
 
 #define FREQ_OFFSET_10MHZ (10)
 #define FREQ_OFFSET_40MHZ (40)
+#define FREQ_OFFSET_80MHZ (80)
 #ifndef SPECTRAL_USE_NL_BCAST
 #define SPECTRAL_USE_NL_BCAST  (0)
 #endif