phy: ti: report 2 non-kernel-doc comments

Do not use "/**" to begin a non-kernel-doc comment.
Fixes these build warnings:

drivers/phy/ti/phy-am654-serdes.c:3: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * PCIe SERDES driver for AM654x SoC

drivers/phy/ti/phy-j721e-wiz.c:3: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Wrapper driver for SERDES used in J721E
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Reported-by: Nkernel test robot <lkp@intel.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: linux-phy@lists.infradead.org
Link: https://lore.kernel.org/r/20211115030559.13994-1-rdunlap@infradead.orgSigned-off-by: NVinod Koul <vkoul@kernel.org>

drivers/phy/ti/phy-am654-serdes.c

 // SPDX-License-Identifier: GPL-2.0
-/**
+/*
  * PCIe SERDES driver for AM654x SoC
  *
  * Copyright (C) 2018 - 2019 Texas Instruments Incorporated - http://www.ti.com/

drivers/phy/ti/phy-j721e-wiz.c

 // SPDX-License-Identifier: GPL-2.0
-/**
+/*
  * Wrapper driver for SERDES used in J721E
  *
  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/