sparc: merge LEON2 and LEON3 linker scripts

There is only one line diff between LEON2 and LEON3 linker scripts:

  -             arch/sparc/cpu/leon2/start.o (.text)
  +             arch/sparc/cpu/leon3/start.o (.text)

They can be written in the same way:

                */start.o (.text)

So, board/gaisler/grsim_leon2/u-boot.lds
and arch/sparc/cpu/leon3/u-boot.lds
can be merged into arch/sparc/cpu/u-boot.lds.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Daniel Hellstrom <daniel@gaisler.com>

arch/sparc/cpu/u-boot.lds

@@ -1,7 +1,5 @@
 /*
- * Linker script for Gaisler Research AB's GRSIM LEON3 simulator.
- *
- * (C) Copyright 2007
+ * (C) Copyright 2007-2008
  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
  *
  * SPDX-License-Identifier:	GPL-2.0+
@@ -43,7 +41,7 @@ SECTIONS
 		_text = .;
 
 		*(.start)
-		arch/sparc/cpu/leon3/start.o (.text)
+		*/start.o (.text)
 /* 8k is the same as the PROM offset from end of main memory, (CONFIG_SYS_PROM_SIZE) */
 		. = ALIGN(8192);
 /* PROM CODE, Will be relocated to the end of memory,