riscv: mm: mark CBO relate initialization funcs as __init

The two functions cbo_get_block_size() and riscv_init_cbo_blocksizes()
are only called during booting, mark them as __init.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230614165504.532-3-jszhang@kernel.orgSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/mm/cacheflush.c

@@ -104,9 +104,9 @@ EXPORT_SYMBOL_GPL(riscv_cbom_block_size);
 unsigned int riscv_cboz_block_size;
 EXPORT_SYMBOL_GPL(riscv_cboz_block_size);
 
-static void cbo_get_block_size(struct device_node *node,
-			       const char *name, u32 *block_size,
-			       unsigned long *first_hartid)
+static void __init cbo_get_block_size(struct device_node *node,
+				      const char *name, u32 *block_size,
+				      unsigned long *first_hartid)
 {
 	unsigned long hartid;
 	u32 val;
@@ -126,7 +126,7 @@ static void cbo_get_block_size(struct device_node *node,
 	}
 }
 
-void riscv_init_cbo_blocksizes(void)
+void __init riscv_init_cbo_blocksizes(void)
 {
 	unsigned long cbom_hartid, cboz_hartid;
 	u32 cbom_block_size = 0, cboz_block_size = 0;