ASoC: Don't squash 16x8 registers down to 8 bits

Currently we'll force all registers to fit in 8 bits before passing
down to the I/O function. Looks like a cut'n'paste bug.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 687beec..6e5e30a 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -319,7 +319,6 @@
 	data[0] = (reg >> 8) & 0xff;
 	data[1] = reg & 0xff;
 	data[2] = value;
-	reg &= 0xff;
 
 	return do_hw_write(codec, reg, value, data, 3);
 }