The dell_quirks[] DMI table is only ever used during initialization.
Mark it as __initconst so its memory can be released afterwards --
roughly 5.7 kB. In turn, the callback function can be marked with
__init, too.

Also the touchpad_led_init() function can be marked __init as it's only
referenced from dell_init() -- an __init function.
Signed-off-by: NMathias Krause <minipli@googlemail.com>
Signed-off-by: NMatthew Garrett <matthew.garrett@nebula.com>