rcar_gen3: drivers: auth-mod: Access SCTLR in EL3

The code runs in EL3, use EL3 accessors to manipulate the cache bits.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>

drivers/renesas/rcar/auth/auth_mod.c

@@ -113,7 +113,7 @@ verify_image:
 	}
 #if RCAR_BL2_DCACHE == 1
 	/* clean and disable */
-	write_sctlr_el1(read_sctlr_el1() & ~SCTLR_C_BIT);
+	write_sctlr_el3(read_sctlr_el3() & ~SCTLR_C_BIT);
 	dcsw_op_all(DCCISW);
 #endif
 	ret = (mmio_read_32(RCAR_BOOT_KEY_CERT_NEW) == RCAR_CERT_MAGIC_NUM) ?
@@ -124,7 +124,7 @@ verify_image:
 
 #if RCAR_BL2_DCACHE == 1
 	/* enable */
-	write_sctlr_el1(read_sctlr_el1() | SCTLR_C_BIT);
+	write_sctlr_el3(read_sctlr_el3() | SCTLR_C_BIT);
 #endif
 
 #endif