feat(rcar3): add cache operations to boot process

Add cache operations because BL2 disabled MMU at the end of the boot
process, but did not clean/invalidate for the cache used by MMU.

Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Id4070b46103ca2b50788b3a99f6961a35df24418

plat/renesas/rcar/bl2_plat_setup.c

@@ -370,6 +370,14 @@ mmu:
 
 	/* Disable data cache (clean and invalidate) */
 	disable_mmu_el3();
+#if RCAR_BL2_DCACHE == 1
+	dcsw_op_all(DCCISW);
+#endif
+	tlbialle3();
+	disable_mmu_icache_el3();
+	plat_invalidate_icache();
+	dsbsy();
+	isb();
 }
 
 static uint32_t is_ddr_backup_mode(void)