ethtool: add two link extended substates of bad signal integrity

mainline inclusion
from mainline-master
commit 5b4ecc3d
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I46N7D
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5b4ecc3d4c4aab8d002fe6358885c10e7b57e432



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ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_REFERENCE_CLOCK_LOST means the input
external clock signal for SerDes is too weak or lost.

ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_ALOS means the received signal for
SerDes is too weak because analog loss of signal.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Yongxin Li <liyongxin1@huawei.com>
Signed-off-by: Junxin Chen <chenjunxin1@huawei.com>
(fix conflicts: replace the last line by "/**")
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>