epiphany: Simplify bsp_specs

Updates #3520.

c/src/lib/libbsp/epiphany/epiphany_sim/bsp_specs

@@ -1,13 +1,9 @@
 %rename endfile old_endfile
 %rename startfile old_startfile
-%rename link old_link
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s crti.o%s crtbegin.o%s -e _start}}
-
-*link:
-%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!nostdlib: %{qrtems: crti.o%s crtbegin.o%s}}
 
 *endfile:
 %{!qrtems: %(old_endfile)} %{qrtems: crtend.o%s crtn.o%s}

c/src/lib/libbsp/epiphany/epiphany_sim/startup/linkcmds

@@ -37,6 +37,7 @@ OUTPUT_FORMAT("elf32-epiphany", "elf32-epiphany", "elf32-epiphany")
 OUTPUT_ARCH (epiphany)
 
 ENTRY (_start)
+STARTUP (start.o)
 
 MEMORY
 {