dragon: wifi: updated btc_param3 in cal file

A small fraction of BT packets had their preamble attenutated by 3 to
10 dBm due to the antenna not switching over in time. Fix this by
making btc_params 3 smaller.

BUG=26208864
TEST=run "wlutil btc_params 3" command and verify that it reads back a
value of 0x4b.

Change-Id: Idc2078b0abf27a7dc32e9d366787038893d9af4c
Signed-off-by: Sameer Nanda <snanda@google.com>
diff --git a/bcmdhd.cal b/bcmdhd.cal
index 7a75804..1624998 100644
--- a/bcmdhd.cal
+++ b/bcmdhd.cal
@@ -136,3 +136,4 @@
 rssicorrnorm_c1=4,4
 rssicorrnorm5g_c0=1,2,3,1,2,3,1,2,3,1,2,3
 rssicorrnorm5g_c1=1,2,3,1,2,3,1,2,3,1,2,3
+btc_params3=75
\ No newline at end of file