zephyr: fix driver include paths
Zephyr will soon no longer add the drivers subdirectory of the include
hierarchy to the search path, so references to driver headers must
include the drivers/ prefix.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
diff --git a/boot/boot_serial/src/boot_serial.c b/boot/boot_serial/src/boot_serial.c
index 02a8da3..409ae96 100644
--- a/boot/boot_serial/src/boot_serial.c
+++ b/boot/boot_serial/src/boot_serial.c
@@ -30,7 +30,7 @@
#include <power/reboot.h>
#include <sys/byteorder.h>
#include <sys/__assert.h>
-#include <flash.h>
+#include <drivers/flash.h>
#include <sys/crc.h>
#include <sys/base64.h>
#include <cbor.h>