[bsp][phytium]适配rt-thread5.0.0 版本 (#7441)

Co-authored-by: 朱耿宇 <zhugengyu@phytium.com.cn>

libcpu/aarch64/cortex-a/entry_point.S

@@ -120,7 +120,7 @@ __start:
     adr x1, __start         /* install early page table */
     ldr x0, =~0x1fffff
     and x0, x1, x0
-    add x1, x0, #0x1000
+    add x1, x0, #0x1000     
 
     msr ttbr0_el1, x0
     msr ttbr1_el1, x1
@@ -130,7 +130,10 @@ __start:
     ldr     x2, =__start
     GET_PHY x3, __start
     sub     x3, x3, x2
+#else
+    mov     x3,0
 #endif
+    
     ldr x2, =0x40000000     /* map 1G memory for kernel space */
     bl rt_hw_mem_setup_early