riscv: Force flat memory model with no-mmu

Compilation errors trigger if ARCH_SPARSEMEM_ENABLE is enabled for
a nommu kernel. Since the sparsemem model does not make sense anyway
for the nommu case, do not allow selecting this option to always use
the flatmem model.

Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: damien-lemoal

arch/riscv/Kconfig

@@ -121,6 +121,7 @@ config ARCH_FLATMEM_ENABLE
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
+	depends on MMU
 	select SPARSEMEM_VMEMMAP_ENABLE
 
 config ARCH_SELECT_MEMORY_MODEL