Update startup_s1sbp6a.S

fix DAPLINK "The transfer timed out." error

Author: sdrstone1

targets/TARGET_Samsung/TARGET_SIDK_S1SBP6A/device/TOOLCHAIN_GCC_ARM/startup_s1sbp6a.S

@@ -41,7 +41,7 @@
 /************************************************************************************
  * Vectors
  ************************************************************************************/
-	.section .vectors
+	.section .vectors, "a"
 	.align 2
 	.globl	__Vectors
 __Vectors: