services/spm_deprecated: update ARM platform specific asserts

Update some asserts that refer to #defines that only occur in
ARM platforms, preventing this code to be used on other platforms.
Instead, use a platform agnostic name, and update all the existing
users.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
diff --git a/include/plat/arm/common/arm_spm_def.h b/include/plat/arm/common/arm_spm_def.h
index bdcbc96..c17b565 100644
--- a/include/plat/arm/common/arm_spm_def.h
+++ b/include/plat/arm/common/arm_spm_def.h
@@ -88,12 +88,12 @@
  * requests. Mapped as RW and NS. Placed after the shared memory between EL3 and
  * S-EL0.
  */
-#define ARM_SP_IMAGE_NS_BUF_BASE	(PLAT_SPM_BUF_BASE + PLAT_SPM_BUF_SIZE)
-#define ARM_SP_IMAGE_NS_BUF_SIZE	ULL(0x10000)
+#define PLAT_SP_IMAGE_NS_BUF_BASE	(PLAT_SPM_BUF_BASE + PLAT_SPM_BUF_SIZE)
+#define PLAT_SP_IMAGE_NS_BUF_SIZE	ULL(0x10000)
 #define ARM_SP_IMAGE_NS_BUF_MMAP	MAP_REGION2(				\
-						ARM_SP_IMAGE_NS_BUF_BASE,	\
-						ARM_SP_IMAGE_NS_BUF_BASE,	\
-						ARM_SP_IMAGE_NS_BUF_SIZE,	\
+						PLAT_SP_IMAGE_NS_BUF_BASE,	\
+						PLAT_SP_IMAGE_NS_BUF_BASE,	\
+						PLAT_SP_IMAGE_NS_BUF_SIZE,	\
 						MT_RW_DATA | MT_NS | MT_USER,	\
 						PAGE_SIZE)