[PATCH 1/2] sandbox: add function os_printf()

[Simon Glass]

Before setting up the devices U-Boot's printf() function cannot be used
for console output. Provide function os_printf() to print to stderr.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 arch/sandbox/cpu/os.c | 13 +++++++++++++
 include/os.h          |  7 +++++++
 2 files changed, 20 insertions(+)

Applied to u-boot-dm, thanks!