mediatek: mt8183: protect 4GB~8GB dram memory

The offset there is the virtual address space on the bus side (1-9GB for 8GB RAM),
and that emi_mpu_set_region_protection will translate to the physical memory space (0-8GB).

8GB is 33-bit (the memory bus width is 33-bit on this platform),
so 0x23FFFFFFFUL-EMI_PHY_OFFSET = 0x1_FFFF_FFFF.

Change-Id: I7be4759ed7546f7e15a5868b6f08988928c34075
Signed-off-by: Xi Chen <xixi.chen@mediatek.com>

plat/mediatek/mt8183/drivers/emi_mpu/emi_mpu.c

@@ -138,15 +138,9 @@ void emi_mpu_init(void)
 				(FORBIDDEN << 6));
 	emi_mpu_set_region_protection(0x52900000UL, 0x5FFFFFFFUL, 2,
 				(FORBIDDEN << 3 | FORBIDDEN << 6));
-	emi_mpu_set_region_protection(0x60000000UL, 0x7FFFFFFFUL, 3,
+	emi_mpu_set_region_protection(0x60000000UL, 0xFFFFFFFFUL, 3,
 				(FORBIDDEN << 3 | FORBIDDEN << 6));
-	emi_mpu_set_region_protection(0x80000000UL, 0x9FFFFFFFUL, 4,
-				(FORBIDDEN << 3 | FORBIDDEN << 6));
-	emi_mpu_set_region_protection(0xA0000000UL, 0xBFFFFFFFUL, 5,
-				(FORBIDDEN << 3 | FORBIDDEN << 6));
-	emi_mpu_set_region_protection(0xC0000000UL, 0xDFFFFFFFUL, 6,
-				(FORBIDDEN << 3 | FORBIDDEN << 6));
-	emi_mpu_set_region_protection(0xE0000000UL, 0xFFFFFFFFUL, 7,
+	emi_mpu_set_region_protection(0x100000000UL, 0x23FFFFFFFUL, 4,
 				(FORBIDDEN << 3 | FORBIDDEN << 6));
 	dump_emi_mpu_regions();
 }