Update to v5.6 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.6

Add a new method for removing structures. This is to deal with the kernel
headers changing some definitions of timeval to __kernel_old_timeval
and itimerval to __kernel_old_itimerval. Remove the __kernel_old_XX
strutures and change the other structures to the previous definitions.

This only works so long as these structures stay the same, if they
diverge, then a different strategy will need to be implemented.

Test: Booted cuttlefish/walleye.
Test: Ran bionic-unit-tests on cuttlefish/walleye.
Change-Id: I0a61f4fa6e4155c602e0414d9b38c2e1637829af
diff --git a/libc/kernel/uapi/sound/hdspm.h b/libc/kernel/uapi/sound/hdspm.h
index dc3192d..bd28e8c 100644
--- a/libc/kernel/uapi/sound/hdspm.h
+++ b/libc/kernel/uapi/sound/hdspm.h
@@ -18,7 +18,9 @@
  ****************************************************************************/
 #ifndef __SOUND_HDSPM_H
 #define __SOUND_HDSPM_H
+#ifdef __linux__
 #include <linux/types.h>
+#endif
 #define HDSPM_MAX_CHANNELS 64
 enum hdspm_io_type {
   MADI,
@@ -144,9 +146,4 @@
   struct hdspm_mixer * mixer;
 };
 #define SNDRV_HDSPM_IOCTL_GET_MIXER _IOR('H', 0x44, struct hdspm_mixer_ioctl)
-typedef struct hdspm_peak_rms hdspm_peak_rms_t;
-typedef struct hdspm_config_info hdspm_config_info_t;
-typedef struct hdspm_version hdspm_version_t;
-typedef struct hdspm_channelfader snd_hdspm_channelfader_t;
-typedef struct hdspm_mixer hdspm_mixer_t;
 #endif