riscv: remove unneeded #include <asm-generic/export.h>

Commit 62694797f5 ("use linux/export.h rather than
asm-generic/export.h") replaced deprecated <asm-generic/export.h>
inclusions.

Commit c2a658d419 ("riscv: lib: vectorize copy_to_user/copy_from_user")
introduced a new instance of #include <asm-generic/export.h>.

arch/riscv/lib/uaccess_vector.S does not use EXPORT_SYMBOL, hence this
include directive is unneeded.

Signed-off-by: Masahiro Yamada <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

arch/riscv/lib/uaccess_vector.S

@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <linux/linkage.h>
-#include <asm-generic/export.h>
 #include <asm/asm.h>
 #include <asm/asm-extable.h>
 #include <asm/csr.h>