riscv: Format assembler files

Use tabs to match the GCC generated assembler output.

Update #3433.

bsps/riscv/riscv/start/start.S

@@ -26,6 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #include <bsp/linker-symbols.h>
 #include <rtems/score/riscv-utility.h>
 #include <rtems/score/cpu.h>
@@ -40,7 +41,9 @@ PUBLIC(bsp_start_vector_table_begin)
 PUBLIC(bsp_start_vector_table_end)
 PUBLIC(_start)
 
-.section .bsp_start_text, "wax"
+	.section	.bsp_start_text, "ax", @progbits
+	.align	2
+
 TYPE_FUNC(_start)
 SYM(_start):
 	la	t0, ISR_Handler

cpukit/score/cpu/riscv/riscv-context-switch.S

@@ -33,8 +33,8 @@
 #include <rtems/asm.h>
 #include <rtems/score/cpu.h>
 
-.section .text, "ax"
-.align 4
+	.section	.text, "ax", @progbits
+	.align	2
 
 PUBLIC(_CPU_Context_switch)
 PUBLIC(_CPU_Context_restore)

cpukit/score/cpu/riscv/riscv-context-validate.S

@@ -30,8 +30,8 @@
 #include <rtems/asm.h>
 #include <rtems/score/cpu.h>
 
-.section	.text
-
+	.section	.text, "ax", @progbits
+	.align	2
 
 PUBLIC(_CPU_Context_validate)
 SYM(_CPU_Context_validate):

cpukit/score/cpu/riscv/riscv-context-volatile-clobber.S

@@ -29,7 +29,8 @@
 
 #include <rtems/asm.h>
 
-.section .text
+	.section	.text, "ax", @progbits
+	.align	2
 
 PUBLIC(_CPU_Context_volatile_clobber)
 SYM(_CPU_Context_volatile_clobber):

cpukit/score/cpu/riscv/riscv-exception-handler.S

@@ -45,8 +45,9 @@ EXTERN(bsp_start_vector_table_begin)
 EXTERN(_Thread_Dispatch)
 PUBLIC(ISR_Handler)
 
-.section .text, "ax"
-.align 4
+	.section	.text, "ax", @progbits
+	.align	2
+
 TYPE_FUNC(ISR_Handler)
 SYM(ISR_Handler):
 	addi	sp, sp, -1 * 36 * CPU_SIZEOF_POINTER