riscv:telink: fix alexa auto connect. (project-chip#36143)

- enlarge the rx stack size to avoid crash.

Signed-off-by: Haiwen Xia <haiwen.xia@telink-semi.com>
Co-authored-by: Haiwen Xia <haiwen.xia@telink-semi.com>

Author: s07641069

config/telink/chip-module/Kconfig.defaults

@@ -137,7 +137,7 @@ config BT_BUF_ACL_TX_SIZE
     default 251
 
 config BT_RX_STACK_SIZE
-    default 810 if BT_B9X
+    default 1352 if BT_B9X
     default 2048 if BT_W91
 
 config BT_HCI_TX_STACK_SIZE