Aarch64 add thread registers (#834)

* add thread registers to AArch64

* update bindings to add AArch64 thread registers

* fix indentation for register read/write switch-case in unicorn_aarch64.c

include/unicorn/arm64.h

@@ -282,6 +282,11 @@ typedef enum uc_arm64_reg {
 
     UC_ARM64_REG_CPACR_EL1,
 
+    //> thread registers
+    UC_ARM64_REG_TPIDR_EL0,
+    UC_ARM64_REG_TPIDRRO_EL0,
+    UC_ARM64_REG_TPIDR_EL1,
+    
     UC_ARM64_REG_ENDING,		// <-- mark the end of the list of registers
 
     //> alias registers