phy: airoha: use C-style SPDX comment for header file

phy: airoha: use C-style SPDX comment for header file

checkpatch reports an improper SPDX comment style for this header:

    WARNING: Improper SPDX comment style for
    'drivers/phy/phy-airoha-pcie-regs.h', please use '/*' instead

Per Documentation/process/license-rules.rst, C header files must use the
'/* SPDX-License-Identifier: ...  */' form instead of the '// ....' form
used in C source files. Fix it.

Signed-off-by: Aditya Dabhade <aditya.dabhade066@gmail.com>
Link: https://patch.msgid.link/20260428193459.5865-1-aditya.dabhade066@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>