Bluetooth: hci_conn: Use kmemdup() to replace kzalloc + memcpy

Bluetooth: hci_conn: Use kmemdup() to replace kzalloc + memcpy

[ Upstream commit 5b6d345d1b65d67624349e5de22227492c637576 ]

Use kmemdup rather than duplicating its implementation.

./net/bluetooth/hci_conn.c:1880:7-14: WARNING opportunity for kmemdup.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5597
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: a09128921820 ("Bluetooth: hci_conn: Fix hci_le_set_cig_params")
Signed-off-by: Sasha Levin <sashal@kernel.org>