refactor(plat/arm): replace FIP base and size macro with a generic name

Replaced PLAT_ARM_FIP_BASE and PLAT_ARM_FIP_MAX_SIZE macro with a
generic name PLAT_ARM_FLASH_IMAGE_BASE and PLAT_ARM_FLASH_IMAGE_MAX_SIZE
so that these macros can be reused in the subsequent GPT based support
changes.

Change-Id: I88fdbd53e1966578af4f1e8e9d5fef42c27b1173
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/plat/arm/board/a5ds/include/platform_def.h b/plat/arm/board/a5ds/include/platform_def.h
index 792a754..9f3df1e 100644
--- a/plat/arm/board/a5ds/include/platform_def.h
+++ b/plat/arm/board/a5ds/include/platform_def.h
@@ -315,8 +315,8 @@
 #define MAX_IO_HANDLES			4
 
 /* Reserve the last block of flash for PSCI MEM PROTECT flag */
-#define PLAT_ARM_FIP_BASE		BOOT_BASE
-#define PLAT_ARM_FIP_MAX_SIZE		(BOOT_SIZE - V2M_FLASH_BLOCK_SIZE)
+#define PLAT_ARM_FLASH_IMAGE_BASE	BOOT_BASE
+#define PLAT_ARM_FLASH_IMAGE_MAX_SIZE	(BOOT_SIZE - V2M_FLASH_BLOCK_SIZE)
 
 #define PLAT_ARM_NVM_BASE		BOOT_BASE
 #define PLAT_ARM_NVM_SIZE		(BOOT_SIZE - V2M_FLASH_BLOCK_SIZE)