sgi-gru: simplify procfs code some more

Use seq_puts and simple string output and not seq_printf with formats
and individual strings to reduce overall object size.

$ size drivers/misc/sgi-gru/gruprocfs.o* (x86-64 defconfig with gru)
   text	   data	    bss	    dec	    hex	filename
   7006	      8	      0	   7014	   1b66	drivers/misc/sgi-gru/gruprocfs.o.new
   7472	      8	      0	   7480	   1d38	drivers/misc/sgi-gru/gruprocfs.o.old

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Dimitri Sivanich <sivanich@hpe.com>
Link: https://lore.kernel.org/r/cce61906a5f7f42f5b2b8b947fc61357bcb56e71.camel@perches.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>