riscv: Fix spelling mistake "SPARSEMEM" to "SPARSMEM"

There is a spelling mistake when SPARSEMEM Kconfig copy.

Fixes: a5406a7ff56e ("riscv: Correct SPARSEMEM configuration")
Cc: stable@vger.kernel.org
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 0d0cf67..4515a10 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -153,7 +153,7 @@
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	depends on MMU
-	select SPARSEMEM_STATIC if 32BIT && SPARSMEM
+	select SPARSEMEM_STATIC if 32BIT && SPARSEMEM
 	select SPARSEMEM_VMEMMAP_ENABLE if 64BIT
 
 config ARCH_SELECT_MEMORY_MODEL