software/bios: place eos s3 interrupt table at .text start when present

litex/soc/software/bios/linker.ld

@@ -8,6 +8,9 @@ SECTIONS
 	.text :
 	{
 		_ftext = .;
+		/* Quicklogic EOS-S3 interrupt vector table uses section name "isr_vector" */
+		/* ARM table has to be placed at start */
+		KEEP(*(.isr_vector))
 		/* Make sure crt0 files come first, and they, and the isr */
 		/* don't get disposed of by greedy optimisation */
 		*crt0*(.text)