riscv: Delete asm/compat.h

riscv does not enable CONFIG_COMPAT in default configurations:
defconfig, allmodconfig and allnoconfig.
Remove the asm/compat.h as it does not seem to add any value to
the architecture without CONFIG_COMPAT.

Now that time compat syscalls are being reused in non CONFIG_COMPAT
modes, asm-generic/compat.h provides definitions for riscv 32 bit
mode.
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NDeepa Dinamani <deepa.kernel@gmail.com>
Cc: palmer@sifive.com
Cc: linux-riscv@lists.infradead.org
Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>

arch/riscv/include/asm/Kbuild

 generic-y += bugs.h
 generic-y += cacheflush.h
 generic-y += checksum.h
+generic-y += compat.h
 generic-y += cputime.h
 generic-y += device.h
 generic-y += div64.h

arch/riscv/include/asm/compat.h

-/*
- * Copyright (C) 2012 ARM Ltd.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#ifndef __ASM_COMPAT_H
-#define __ASM_COMPAT_H
-#ifdef CONFIG_COMPAT
-
-#if defined(CONFIG_64BIT)
-#define COMPAT_UTS_MACHINE "riscv64\0\0"
-#elif defined(CONFIG_32BIT)
-#define COMPAT_UTS_MACHINE "riscv32\0\0"
-#else
-#error "Unknown RISC-V base ISA"
-#endif
-
-#endif /*CONFIG_COMPAT*/
-#endif /*__ASM_COMPAT_H*/