cros_ec_sandbox.c: Drop spi.h include

As this driver needs to use the special sandbox <asm/malloc.h> header
rather than normal malloc, it must be careful of the includes it brings
in. It does not need <spi.h> for anything, so drop it.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/misc/cros_ec_sandbox.c

@@ -15,7 +15,6 @@
 #include <log.h>
 #include <os.h>
 #include <u-boot/sha256.h>
-#include <spi.h>
 #include <time.h>
 #include <asm/malloc.h>
 #include <asm/state.h>