riscv: Add __init section marker to some functions again

These functions are not needed after booting, so mark them as __init
to move them to the __init section.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

arch/riscv/kernel/cpufeature.c

@@ -59,7 +59,7 @@ bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, int bit)
 }
 EXPORT_SYMBOL_GPL(__riscv_isa_extension_available);
 
-void riscv_fill_hwcap(void)
+void __init riscv_fill_hwcap(void)
 {
 	struct device_node *node;
 	const char *isa;

arch/riscv/mm/context.c

@@ -213,7 +213,7 @@ static inline void set_mm(struct mm_struct *mm, unsigned int cpu)
 		set_mm_noasid(mm);
 }
 
-static int asids_init(void)
+static int __init asids_init(void)
 {
 	unsigned long old;