Fix typo in macros, "FIRMEWARE" -> "FIRMWARE"

Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig
index 92a2b58..16c83e8 100644
--- a/arch/arm/cpu/armv8/Kconfig
+++ b/arch/arm/cpu/armv8/Kconfig
@@ -65,7 +65,7 @@
 	    - Address of secure firmware.
 	    - Address to hold the return address from secure firmware.
 	    - Secure firmware FIT image related information.
-	      Such as: SEC_FIRMWARE_FIT_IMAGE and SEC_FIRMEWARE_FIT_CNF_NAME
+	      Such as: SEC_FIRMWARE_FIT_IMAGE and SEC_FIRMWARE_FIT_CNF_NAME
 	    - The target exception level that secure monitor firmware will
 	      return to.