riscv: add run mode configuration for SPL

U-Boot SPL can be run in a different privilege mode from U-Boot proper.
Add new configuration entries for SPL to allow the run mode to be
configured independently of U-Boot proper.

Extend all uses of the CONFIG_RISCV_SMODE and CONFIG_RISCV_MMODE
configuration symbols to also cover the SPL equivalents. Ensure that
files compatible with only one privilege mode are not included in builds
targeting an incompatible privilege mode.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
index 6ae6ebb..e4bc5df 100644
--- a/arch/riscv/lib/Makefile
+++ b/arch/riscv/lib/Makefile
@@ -10,13 +10,16 @@
 obj-$(CONFIG_CMD_BOOTI) += bootm.o image.o
 obj-$(CONFIG_CMD_GO) += boot.o
 obj-y	+= cache.o
-obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
+ifeq ($(CONFIG_$(SPL_)RISCV_MMODE),y)
 obj-$(CONFIG_SIFIVE_CLINT) += sifive_clint.o
 obj-$(CONFIG_ANDES_PLIC) += andes_plic.o
 obj-$(CONFIG_ANDES_PLMT) += andes_plmt.o
+else
+obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
+obj-$(CONFIG_SBI_IPI) += sbi_ipi.o
+endif
 obj-y	+= interrupts.o
 obj-y	+= reset.o
-obj-$(CONFIG_SBI_IPI) += sbi_ipi.o
 obj-y   += setjmp.o
 obj-$(CONFIG_SMP) += smp.o