RISC-V: KVM: Fix build with vector support disabled

The kernel-mode vector context handling added unconditional calls to
get_cpu_vector_context(), put_cpu_vector_context() and
__kvm_riscv_vector_restore() in vcpu.c. With CONFIG_RISCV_ISA_V=n, these
calls fail to build due to missing declarations.

The get/put helpers already have no-op definitions in asm/vector.h, but
kvm_vcpu_vector.h only includes that header when CONFIG_RISCV_ISA_V is
enabled. Include it unconditionally and provide a no-op implementation
of __kvm_riscv_vector_restore() for the disabled configuration, matching
the other vector context helpers.

The paths that set RISCV_V_VCPU_NEED_RESTORE are compiled out when vector
support is disabled, so the restore stub does not discard any live
vector state. Keep it __always_inline for its noinstr caller. The vector
enabled implementation is unchanged.

Fixes: b5060a4aa33d ("RISC-V: KVM: fix vcpu vector context handling for kernel-mode vector")
Signed-off-by: Zhanpeng Zhang <zhangzhanpeng.jasper@bytedance.com>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260922021823.44251-2-zhangzhanpeng.jasper@bytedance.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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