plat/sgi: refactor DMC-620 error handling SMC function id

The macros defining the SMC function ids for DMC-620 error handling are
listed in the sgi_base_platform_def.h header file. But these macros are
not applicable for all platforms supported under plat/sgi. So move these
macro definitions to sgi_ras.c file in which these are consumed. While
at it, remove the AArch32 and error injection function ids as these are
unused.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: I249b54bf4c1b1694188a1e3b297345b942f16bc9
diff --git a/plat/arm/css/sgi/include/sgi_ras.h b/plat/arm/css/sgi/include/sgi_ras.h
index a449eae..4b8a0d1 100644
--- a/plat/arm/css/sgi/include/sgi_ras.h
+++ b/plat/arm/css/sgi/include/sgi_ras.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,6 +7,10 @@
 #ifndef SGI_RAS_H
 #define SGI_RAS_H
 
+/* Platform specific SMC FID's used for DMC-620 RAS error handling */
+#define SP_DMC_ERROR_OVERFLOW_EVENT_AARCH64	0xC4000043
+#define SP_DMC_ERROR_ECC_EVENT_AARCH64		0xC4000044
+
 /*
  * Mapping the RAS interrupt with SDEI event number and the event
  * id used with Standalone MM code