[PATCH 4.2 025/110] ALSA: hdac: Explicitly add io.h

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Vinod Koul commit 42f2bb1c494543084b764e1ca253c73db910daf2 upstream. Compiling the hdac extended core on arm fails with below error: sound/hda/ext/hdac_ext_bus.c: In function

[PATCH 4.2 025/110] ALSA: hdac: Explicitly add io.h

4.2-stable review patch. If anyone has any objections, please let me know. -- From: Vinod Koul commit 42f2bb1c494543084b764e1ca253c73db910daf2 upstream. Compiling the hdac extended core on arm fails with below error: sound/hda/ext/hdac_ext_bus.c: In