riscv: Fix coding style issues in the linker script

There are several coding style issues in the linker script. Fix them.

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

arch/riscv/cpu/u-boot.lds

@@ -3,14 +3,14 @@
  * Copyright (C) 2017 Andes Technology Corporation
  * Rick Chen, Andes Technology Corporation <rick@andestech.com>
  */
+
 OUTPUT_ARCH("riscv")
 ENTRY(_start)
 
 SECTIONS
 {
 	. = ALIGN(4);
-	.text :
+	.text : {
-	{
 		arch/riscv/cpu/ax25/start.o	(.text)
 	}
 
@@ -23,8 +23,7 @@ SECTIONS
 		__efi_runtime_stop = .;
 	}
 
-	.text_rest :
+	.text_rest : {
-	{
 		*(.text*)
 	}
 
@@ -86,5 +85,4 @@ SECTIONS
 		. = ALIGN(4);
 		__bss_end = .;
 	}
-
 }