Merge patch series "'eeprom' command improvements"

Marek Behún <kabel@kernel.org> says:

This series contains improvements for the 'eeprom' command:
- refactors
- fixes
- improvements
- ability to use driver model EEPROMs (uclass UCLASS_I2C_EEPROM)
- more flexible EEPROM layout support

It should not cause any behavior change for any existing board.

This series is a dependency for some DDR issue fixes for Turris Omnia.
I will be sending that one separately.

github PR link (with CI):
  https://github.com/u-boot/u-boot/pull/540
- there is a failure for
    test.py for sandbox sandbox_clang
  but it seems unrelated to these changes

include/eeprom_layout.h

@@ -9,6 +9,8 @@
 #ifndef _LAYOUT_
 #define _LAYOUT_
 
+#include <eeprom_field.h>
+
 #define RESERVED_FIELDS			NULL
 #define LAYOUT_VERSION_UNRECOGNIZED	-1
 #define LAYOUT_VERSION_AUTODETECT	-2
@@ -24,6 +26,8 @@ struct eeprom_layout {
 		      char *new_data);
 };
 
+struct eeprom_field *eeprom_layout_find_field(struct eeprom_layout *layout,
+					      char *field_name, bool warn);
 void eeprom_layout_setup(struct eeprom_layout *layout, unsigned char *buf,
 			 unsigned int buf_size, int layout_version);
 __weak void __eeprom_layout_assign(struct eeprom_layout *layout,