ASoC: rt5514: make array div static const, makes object smaller

ASoC: rt5514: make array div static const, makes object smaller

Don't populate the array div on the stack but instead it
static const. Makes the object code smaller by 48 bytes.

Before:
   text    data     bss     dec     hex filename
  53894   16368     128   70390   112f6 ./sound/soc/codecs/rt5514.o

After:
   text    data     bss     dec     hex filename
  53750   16464     128   70342   112c6 ./sound/soc/codecs/rt5514.o

(gcc version 10.2.0)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210801064023.138359-1-colin.king@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>