It seems useful to make sandbox its own log category since it is used for
so much testing. Add this as a new category.
Signed-off-by: Simon Glass <sjg@chromium.org>
LOGC_DT, /* Device-tree */
LOGC_EFI, /* EFI implementation */
LOGC_ALLOC, /* Memory allocation */
+ LOGC_SANDBOX, /* Related to the sandbox board */
LOGC_COUNT, /* Number of log categories */
LOGC_END, /* Sentinel value for a list of log categories */