ASoC: rt5668: fix incorrect 'and' operator

Currently logical and is being used instead of bitwise and. Fix this.

Detected by CoverityScan, CID#1468008 ("Logical vs bitwise operator")

Fixes: d59fb285 ("ASoC: rt5668: add rt5668B codec driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>