treewide: Remove repeated words

Found by linter

Change-Id: I7a49cce0b56cf83d0e4490733f9190284a314c4a
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72896
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

src/arch/riscv/trap_util.S

@@ -110,7 +110,7 @@ trap_entry:
 .Lsmp_hang:
   bnez sp, .Lsmp_hang
 
-  # Use a different stack than in the main context, to to avoid overwriting
+  # Use a different stack than in the main context, to avoid overwriting
   # stack data.
   # TODO: Maybe use the old stack pointer (plus an offset) instead. But only if
   # the previous mode was M, because it would be a very bad idea to use a stack

src/arch/x86/exit_car.S

@@ -4,7 +4,7 @@
 #include <cpu/x86/cr.h>
 #include <cpu/x86/cache.h>
 
-/* Place the stack in the bss section. It's not necessary to define it in the
+/* Place the stack in the bss section. It's not necessary to define it in
  * the linker script. */
 	.section .bss, "aw", @nobits
 .global _stack