toolchain: gcc: Define output format for or1k-elf

The OpenRISC or1k-elf GCC compiler output format is named "elf32-or1k".
This patch adds an OUTPUT_FORMAT linker macro for this platform.

Signed-off-by: Joel Holdsworth <[email protected]>

Author: jhol

include/zephyr/linker/linker-tool-gcc.h

@@ -59,6 +59,8 @@
 	/* Not needed */
 #elif defined(CONFIG_SPARC)
 	OUTPUT_FORMAT("elf32-sparc")
+#elif defined(CONFIG_OPENRISC)
+	OUTPUT_FORMAT("elf32-or1k")
 #else
 	#error Arch not supported.
 #endif