linux-phytec-fsl

ISDN: eicon: replace custom hex_asc_lo() / hex_pack_byte()

Instead of custom approach re-use generic helpers to convert byte to hex
format.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>