[U-Boot] [PATCH v3 04/10] sound: Add a driver for max98088

[sjg at google.com]

This chip is used by spring. Add a driver for it and update the
samsung_sound driver to pick it up.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v3:
- Fix remaining 'return -1' statements to use a real error

Changes in v2: None

 drivers/sound/Kconfig         |   8 +
 drivers/sound/Makefile        |   1 +
 drivers/sound/max98088.c      | 431 ++++++++++++++++++++++++++++++++++
 drivers/sound/max98088.h      | 192 +++++++++++++++
 drivers/sound/samsung_sound.c |   2 +-
 5 files changed, 633 insertions(+), 1 deletion(-)
 create mode 100644 drivers/sound/max98088.c
 create mode 100644 drivers/sound/max98088.h

Applied to u-boot-dm, thanks!