hikey960: Increase max xlat tables

It is cleaner to use the same number of tables regardless of whether
OP-TEE is used or not. This doesn't result in a significant memory
usage increase.

Change-Id: I38bcaa3f2f197c0a352153117592749f189a265c
Signed-off-by: Joel Hutton <Joel.Hutton@Arm.com>

plat/hisilicon/hikey960/include/platform_def.h

@@ -122,11 +122,7 @@
 #endif
 
 #ifdef IMAGE_BL2
-#ifdef SPD_opteed
 #define MAX_XLAT_TABLES			4
-#else
-#define MAX_XLAT_TABLES			3
-#endif
 #endif
 
 #define MAX_MMAP_REGIONS		16