qcacmn: Correct frequency offset computation during bin5 radar

Changes configured to operate in Channel 100(HT80), if bin5 chirp
radar is injected at center frequency at 5530 MHz, instead of adding
channel 108(HT20), it adds channel 116(HT20) of adjacent 80 MHz band
to NOL list.

We have the following variable assignments in function
dfs_pulses_within_window:

dfs->dfs_min_sidx = pl->pl_elems[*index].p_sidx
dfs->dfs_max_sidx = pl->pl_elems[*index].p_sidx

Since the variable pl->pl_elems[*index].p_sidx is of signed type
and variables dfs->dfs_min_sidx/dfs->dfs_max_sidx are of unsigned type,
if the value of the variable pl->pl_elems[*index].p_sidx is negative,
the values of the variables dfs->dfs_min_sidx/dfs->dfs_max_sidx become
very large unsigned value.

When sidx is converted to frequency offset, the frequency offset
also becomes very large and it is greater than 40Mhz(half of HT80).
In this case, 50MHz is added to center frequency 5530 MHz, which
becomes 5580MHz(channel 116(HT20)). This results in the channel
116(HT20) of adjacent 80 MHz band to be added to NOL list.

Change the type of the variables dfs->dfs_min_sidx/dfs->dfs_max_sidx
from unsigned to signed so that assignments do not alter the actual
value of the frequency offset.

Change-Id: I13995888b618d9dd8a91447d5dffe27aa2e27a27
CRs-Fixed: 2342743

umac/dfs/core/src/dfs.h

@@ -1142,8 +1142,8 @@ struct wlan_dfs {
 	int            dfs_status_timeout_override;
 #endif
 	bool           dfs_is_stadfs_enabled;
-	uint32_t       dfs_min_sidx;
-	uint32_t       dfs_max_sidx;
+	int32_t        dfs_min_sidx;
+	int32_t        dfs_max_sidx;
 	uint8_t        dfs_seg_id;
 	uint8_t        dfs_is_chirp;
 	uint8_t        dfs_bw_reduced;