cmd/sbi: use constants instead of numerical values

Use constants for extension IDs.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/cmd/riscv/sbi.c b/cmd/riscv/sbi.c
index 90c0811..65a2c93 100644
--- a/cmd/riscv/sbi.c
+++ b/cmd/riscv/sbi.c
@@ -29,21 +29,21 @@
 };
 
 static struct sbi_ext extensions[] = {
-	{ 0x00000000, "sbi_set_timer" },
-	{ 0x00000001, "sbi_console_putchar" },
-	{ 0x00000002, "sbi_console_getchar" },
-	{ 0x00000003, "sbi_clear_ipi" },
-	{ 0x00000004, "sbi_send_ipi" },
-	{ 0x00000005, "sbi_remote_fence_i" },
-	{ 0x00000006, "sbi_remote_sfence_vma" },
-	{ 0x00000007, "sbi_remote_sfence_vma_asid" },
-	{ 0x00000008, "sbi_shutdown" },
-	{ 0x00000010, "SBI Base Functionality" },
-	{ 0x54494D45, "Timer Extension" },
-	{ 0x00735049, "IPI Extension" },
-	{ 0x52464E43, "RFENCE Extension" },
-	{ 0x0048534D, "Hart State Management Extension" },
-	{ 0x53525354, "System Reset Extension" },
+	{ SBI_EXT_0_1_SET_TIMER,	      "sbi_set_timer" },
+	{ SBI_EXT_0_1_CONSOLE_PUTCHAR,	      "sbi_console_putchar" },
+	{ SBI_EXT_0_1_CONSOLE_GETCHAR,	      "sbi_console_getchar" },
+	{ SBI_EXT_0_1_CLEAR_IPI,	      "sbi_clear_ipi" },
+	{ SBI_EXT_0_1_SEND_IPI,		      "sbi_send_ipi" },
+	{ SBI_EXT_0_1_REMOTE_FENCE_I,	      "sbi_remote_fence_i" },
+	{ SBI_EXT_0_1_REMOTE_SFENCE_VMA,      "sbi_remote_sfence_vma" },
+	{ SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, "sbi_remote_sfence_vma_asid" },
+	{ SBI_EXT_0_1_SHUTDOWN,		      "sbi_shutdown" },
+	{ SBI_EXT_BASE,			      "SBI Base Functionality" },
+	{ SBI_EXT_TIME,			      "Timer Extension" },
+	{ SBI_EXT_IPI,			      "IPI Extension" },
+	{ SBI_EXT_RFENCE,		      "RFENCE Extension" },
+	{ SBI_EXT_HSM,			      "Hart State Management Extension" },
+	{ SBI_EXT_SRST,			      "System Reset Extension" },
 };
 
 static int do_sbi(struct cmd_tbl *cmdtp, int flag, int argc,