xen/arm: arm32: Allow Xen to boot on unidentified CPUs

Currently if the processor id is not identified (ie it is missing in proc-v7.S)
, then Xen boot fails quite early.
We have removed this restriction as for some CPUs (eg Cortex-R52), there isn't
any special initialization required.

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/arm32/head.S

@@ -324,7 +324,7 @@ cpu_init:
         PRINT("- Missing processor info: ")
         print_reg r4
         PRINT(" -\r\n")
-        b     fail
+        b     cpu_init_done
 1:
         /* Jump to cpu_init */
         ldr   r1, [r1, #PROCINFO_cpu_init]  /* r1 := vaddr(init func) */