ASoC: rt1308: simplify the EFUSE read function

The rt1308_efuse function contains many redundant settings.
We remove the redundant settings and the function still works.

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20190719063235.18757-1-shumingf@realtek.com


Signed-off-by: Mark Brown <broonie@kernel.org>