riscv: Bump COMMAND_LINE_SIZE value to 1024

Increase COMMAND_LINE_SIZE as the current default value is too low
for syzbot kernel command line.

There has been considerable discussion on this patch that has led to a
larger patch set removing COMMAND_LINE_SIZE from the uapi headers on all
ports.  That's not quite done yet, but it's gotten far enough we're
confident this is not a uABI change so this is safe.

Reported-by: Dmitry Vyukov <[email protected]>
Signed-off-by: Alexandre Ghiti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[Palmer: it's not uabi]
Link: https://lore.kernel.org/linux-riscv/[email protected]/#t
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: AlexGhiti

arch/riscv/include/uapi/asm/setup.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
+
+#ifndef _UAPI_ASM_RISCV_SETUP_H
+#define _UAPI_ASM_RISCV_SETUP_H
+
+#define COMMAND_LINE_SIZE	1024
+
+#endif /* _UAPI_ASM_RISCV_SETUP_H */