mtd: spi-nor: debugfs: fix format specifier

The intention was to print the JEDEC ID in the following format:
  nn nn nn

In this case format specifier has to be "%*ph". Fix it.

Fixes: 0257be79 ("mtd: spi-nor: expose internal parameters via debugfs")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20220512112027.3771734-1-michael@walle.cc