allwinner: sun50i_a64: remove unneeded VER_REG offset

The relative VER_REG *offset* is the same across all known SoCs, so we
can define this offset near it's user.

Remove it from the memory map.
Reported-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

plat/allwinner/sun50i_a64/include/sunxi_mmap.h

@@ -27,7 +27,6 @@
 #define SUNXI_CPU_MBIST_BASE		0x01502000
 #define SUNXI_CPUCFG_BASE		0x01700000
 #define SUNXI_SYSCON_BASE		0x01c00000
-#define SUNXI_SRAM_VER_REG		(SUNXI_SYSCON_BASE + 0x24)
 #define SUNXI_DMA_BASE			0x01c02000
 #define SUNXI_KEYMEM_BASE		0x01c0b000
 #define SUNXI_SMHC0_BASE		0x01c0f000