sandbox: Add missing errno.h includes in a few files

These files use error numbering, so add the include.

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

Merge branch 'u-boot/master' into 'u-boot-arm/master'

dm: sandbox: Add a emulated PCI device as an example

This device sits on the sandbox PCI bus and provides a case-swapping
service for sandbox. It illustrates the use of both PCI I/O and PCI
memory a

dm: sandbox: Add a emulated PCI device as an example

This device sits on the sandbox PCI bus and provides a case-swapping
service for sandbox. It illustrates the use of both PCI I/O and PCI
memory accesses.

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

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