Input: cypress-sf - constify struct i2c_device_id

'struct i2c_device_id' is not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   6438	    618	      0	   7056	   1b90	drivers/input/keyboard/cypress-sf.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   6502	    554	      0	   7056	   1b90	drivers/input/keyboard/cypress-sf.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/4bc3e3b4d10223d9df850fe4ba48f1cefd197082.1731689418.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>