riscv: cpu: th1520: Build spl.c for SPL only

Symbols in spl.c only function correctly in SPL stage. Build the file
for SPL only to avoid weak symbols in proper U-Boot being unexpectedly
reloaded.

Fixes: 5fe9ced3552 ("riscv: cpu: Add TH1520 CPU support")
Signed-off-by: Yao Zi <[email protected]>
Reviewed-by: Leo Yu-Chi Liang <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/riscv/cpu/th1520/Makefile b/arch/riscv/cpu/th1520/Makefile
index 5d806c06e2e..d971ea7390d 100644
--- a/arch/riscv/cpu/th1520/Makefile
+++ b/arch/riscv/cpu/th1520/Makefile
@@ -5,4 +5,4 @@
 obj-y += cache.o
 obj-y += cpu.o
 obj-y += dram.o
-obj-y += spl.o
+obj-$(CONFIG_SPL_BUILD) += spl.o