armv8: Add tlb_allocated to arch global data

When secure ram is used, MMU tables have to be put into secure ram.
To use common MMU code, gd->arch.tlb_addr will be used to host TLB
entry pointer. To save allocated memory for later use, tlb_allocated
variable is added to global data structure.

Signed-off-by: York Sun <york.sun@nxp.com>

arch/arm/include/asm/global_data.h

@@ -57,6 +57,7 @@ struct arch_global_data {
 	 *             0x2 maintained
 	 */
 	phys_addr_t secure_ram;
+	unsigned long tlb_allocated;
 #endif
 
 #ifdef CONFIG_OMAP_COMMON