fix(mt8196): remove CPU_IDLE_SRAM_BASE entry from plat_mmap

This region is defined in LPM driver. Prefer managing this region in
LPM driver and remove it from plat_mmap and platform_def.h.

Change-Id: I57bfaad88a28d4f29e2b132ba080bc7d5b8248d8
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>
diff --git a/plat/mediatek/mt8196/include/platform_def.h b/plat/mediatek/mt8196/include/platform_def.h
index 83370d6..4fa3079 100644
--- a/plat/mediatek/mt8196/include/platform_def.h
+++ b/plat/mediatek/mt8196/include/platform_def.h
@@ -280,8 +280,6 @@
  ******************************************************************************/
 #define PLAT_CPU_PM_B_BUCK_ISO_ID	(6)
 #define PLAT_CPU_PM_ILDO_ID		(6)
-#define CPU_IDLE_SRAM_BASE		(0x11B000)
-#define CPU_IDLE_SRAM_SIZE		(0x1000)
 
 /*******************************************************************************
  * SYSTIMER related definitions
diff --git a/plat/mediatek/mt8196/plat_mmap.c b/plat/mediatek/mt8196/plat_mmap.c
index d32f4ee..11cb700 100644
--- a/plat/mediatek/mt8196/plat_mmap.c
+++ b/plat/mediatek/mt8196/plat_mmap.c
@@ -15,8 +15,6 @@
 			MT_DEVICE | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(MTK_DEV_RNG1_BASE, MTK_DEV_RNG1_SIZE,
 			MT_DEVICE | MT_RW | MT_SECURE),
-	MAP_REGION_FLAT(CPU_IDLE_SRAM_BASE, CPU_IDLE_SRAM_SIZE,
-			MT_DEVICE | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(DP_SEC_BASE, DP_SEC_SIZE,
 			MT_DEVICE | MT_RW | MT_SECURE),
 	MAP_REGION_FLAT(EDP_SEC_BASE, EDP_SEC_SIZE,