parisc: Include stringify.h to avoid build error in crypto/api.c

Include stringify.h to avoid this build error:
 arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify'
 arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]

Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: kernel test robot <lkp@intel.com>