src/arch: Drop unneeded empty lines

Change-Id: Ic86d2e6ad00cf190a2a728280f1a738486cb18c8
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44591
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/arch/arm/armv7/cache_m.c

@@ -3,7 +3,6 @@
  * cache.c: Cache maintenance routines for ARMv7-M
  */
 
-
 #include <arch/cache.h>
 
 void tlb_invalidate_all(void)