riscv: remove RISC-V standalone linker script

Standalone applications do not require a separate linker script and can
use the default linker script of the compiler instead. Remove the RISC-V
standalone linker script.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>

examples/standalone/riscv.lds

@@ -1,40 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Copyright (C) 2017 Andes Technology Corporation
- * Rick Chen, Andes Technology Corporation <rick@andestech.com>
- */
-
-OUTPUT_ARCH(riscv)
-ENTRY(_start)
-SECTIONS
-{
-    . = ALIGN(4);
-    .text :
-    {
-        *(.text)
-    }
-
-    . = ALIGN(4);
-    .data : {
-			__global_pointer$ = . + 0x800;
-			*(.data)
-		}
-
-    . = ALIGN(4);
-
-    .got : {
-        __got_start = .;
-        *(.got)
-        __got_end = .;
-    }
-
-     . = ALIGN(4);
-    __bss_start = .;
-    .bss : { *(.bss) }
-    __bss_end = .;
-
-    . = ALIGN(4);
-    .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
-
-    _end = .;
-}