Staging: rtl8723bs: add missing blank line in HalBtc8723b1Ant.c

Staging: rtl8723bs: add missing blank line in HalBtc8723b1Ant.c

This commit fixes the following checkpatch.pl warning:

WARNING: Missing a blank line after declarations
+	struct btc_bt_link_info *pBtLinkInfo = &pBtCoexist->btLinkInfo;
+	halbtc8723b1ant_BtRssiState(2, 28, 0);

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Link: https://lore.kernel.org/r/20210518044119.2960494-6-desmondcheongzx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>