net: ks8851: use %*ph to print small buffer

Use %*ph format to print small buffer as hex string. It will change
the output format from 32-bit words to byte hexdump, but this is not
critical as it's only a debug message.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Message-ID: <20241016132615.899037-1-andriy.shevchenko@linux.intel.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>