headers: don't depend on errno.h being available

These headers follow the pattern:

| #if CONFIG_IS_ENABLED(FANCY_FEATURE)
|   void foo(void);
| #else
|   static inline void foo(void) { return -ENOSYS; }
| #endif

In the #else path ENOSYS is used, however linux/errno.h is not included.
If errno.h has not been included already the compiler errors out even
if the inline function is not referenced.

Make those headers self contained.

Upstream-Status: Submitted [https://lore.kernel.org/all/20240118181106.4133924-1-max.oss.09@gmail.com/T/#u]

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/soc.h b/include/soc.h
index a52a300a84..197d58443a 100644
--- a/include/soc.h
+++ b/include/soc.h
@@ -7,6 +7,8 @@
 #ifndef __SOC_H
 #define __SOC_H
 
+#include <linux/errno.h>
+
 #define SOC_MAX_STR_SIZE	128
 
 struct udevice;