chore(ethos-n): update npu firmware version

A newer version of the Arm(R) Ethos(TM)-N NPU firmware is now available,
and so the constants in the SiP service need updating.

Change-Id: I8eee7d543bac0a726c6161a16b3df90609f6b443
Signed-off-by: Rob Hughes <robert.hughes@arm.com>
diff --git a/drivers/arm/ethosn/ethosn_big_fw.c b/drivers/arm/ethosn/ethosn_big_fw.c
index 628f5d9..ea48a24 100644
--- a/drivers/arm/ethosn/ethosn_big_fw.c
+++ b/drivers/arm/ethosn/ethosn_big_fw.c
@@ -12,7 +12,7 @@
 #define ETHOSN_BIG_FW_MAGIC	('E' | ('N' << 8) | ('F' << 16) | ('W' << 24))
 
 /* Supported big firmware version */
-#define ETHOSN_BIG_FW_VERSION_MAJOR	11
+#define ETHOSN_BIG_FW_VERSION_MAJOR	12
 
 #define ETHOSN_ARCH_VER_MAJOR_MASK	U(0xF000)
 #define ETHOSN_ARCH_VER_MAJOR_SHIFT	U(0xC)