staging: greybus: use preferred kernel type u16
As suggested by checkpatch.pl:
CHECK: Prefer kernel type 'u16' over 'uint16_t'
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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