cm_t335: fix linker file to produce full ELF

Newly added cm_t335 was missed in commit 47ed5dd0 which
made ARM targets produce full ELF files. Fix its linker
script.

This change is binary-invariant when only .dynsym, .dynstr,
.dynamic, .plt, .interp and .gun sections are declared.

Sections .hash, .got.plt, .dynbss and .ARM.exidx are also
declared so that their (unused) content is moved out of the
u-boot binary.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>

board/compulab/cm_t335/u-boot.lds

@@ -92,10 +92,14 @@ SECTIONS
 		KEEP(*(.__bss_end));
 	}
 
-	/DISCARD/ : { *(.dynsym) }
-	/DISCARD/ : { *(.dynstr*) }
-	/DISCARD/ : { *(.dynamic*) }
-	/DISCARD/ : { *(.plt*) }
-	/DISCARD/ : { *(.interp*) }
-	/DISCARD/ : { *(.gnu*) }
+	.dynsym _end : { *(.dynsym) }
+	.hash : { *(.hash) }
+	.got.plt : { *(.got.plt) }
+	.dynbss : { *(.dynbss) }
+	.dynstr : { *(.dynstr*) }
+	.dynamic : { *(.dynamic*) }
+	.plt : { *(.plt*) }
+	.interp : { *(.interp*) }
+	.gnu : { *(.gnu*) }
+	.ARM.exidx : { *(.ARM.exidx*) }
 }