ARM: socfpga: Fix Documentation errors in scu_registers

According to ARM Cortex-A9 MPCore TRM section 2.2 - SCU registers
Access Control register offset is 0x50.

Signed-off-by: Ben Kalo <ben.h.kalo@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>

arch/arm/mach-socfpga/include/mach/scu.h

@@ -14,8 +14,8 @@ struct scu_registers {
 	u32	_pad_0x10_0x3c[12];	/* 0x10 */
 	u32	fsar;			/* 0x40 */
 	u32	fear;
-	u32	_pad_0x48_0x50[2];
-	u32	acr;			/* 0x54 */
+	u32	_pad_0x48_0x4c[2];
+	u32	acr;			/* 0x50 */
 	u32	sacr;
 };