riscv: rename CPU_RISCV_32/64 to match architecture names ARCH_RV32I/64I

RISC-V defines the base integer instruction sets as RV32I and RV64I.
Rename CPU_RISCV_32 and CPU_RISCV_64 to ARCH_RV32I and ARCH_RV64I to
match this convention.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S
index 8f5a6a2..72bc924 100644
--- a/arch/riscv/lib/setjmp.S
+++ b/arch/riscv/lib/setjmp.S
@@ -6,7 +6,7 @@
 #include <config.h>
 #include <linux/linkage.h>
 
-#ifdef CONFIG_CPU_RISCV_64
+#ifdef CONFIG_ARCH_RV64I
 #define STORE_IDX(reg, idx)	sd reg, (idx*8)(a0)
 #define LOAD_IDX(reg, idx)	ld reg, (idx*8)(a0)
 #else