feat(ethos-n): update npu error handling

Changes have been made in NPU firmware version 13 around error handling
which require some different register values to be set in AUXCTLR and
SYSCTRL1.

SiP service version number has been bumped up to 15 to reflect these
changes.

Change-Id: I6cda0048dc75df2150f7a0fe25f12ba6bf119ced
Signed-off-by: Rob Hughes <robert.hughes@arm.com>
diff --git a/include/drivers/arm/ethosn.h b/include/drivers/arm/ethosn.h
index 993dd12..51ce65d 100644
--- a/include/drivers/arm/ethosn.h
+++ b/include/drivers/arm/ethosn.h
@@ -47,7 +47,7 @@
 #define is_ethosn_fid(_fid) (((_fid) & ETHOSN_FID_MASK) == ETHOSN_FID_VALUE)
 
 /* Service version  */
-#define ETHOSN_VERSION_MAJOR U(3)
+#define ETHOSN_VERSION_MAJOR U(4)
 #define ETHOSN_VERSION_MINOR U(0)
 
 /* Return codes for function calls */