RISC-V: Initialize SBI early

Currently, SBI is initialized towards the end of arch setup. This prevents
the set memory operations to be invoked earlier as it requires a full tlb
flush.

Initialize SBI as early as possible.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Tested-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/kernel/setup.c

@@ -249,6 +249,9 @@ void __init setup_arch(char **cmdline_p)
 		pr_err("No DTB found in kernel mappings\n");
 #endif
 
+	if (IS_ENABLED(CONFIG_RISCV_SBI))
+		sbi_init();
+
 #ifdef CONFIG_SWIOTLB
 	swiotlb_init(1);
 #endif
@@ -257,10 +260,6 @@ void __init setup_arch(char **cmdline_p)
 	kasan_init();
 #endif
 
-#if IS_ENABLED(CONFIG_RISCV_SBI)
-	sbi_init();
-#endif
-
 #ifdef CONFIG_SMP
 	setup_smp();
 #endif