csky: fix syscache.c fallthrough warning

This case of the switch statement falls through to the following case.
This appears to be on purpose, so declare it as OK.

../arch/csky/mm/syscache.c: In function '__do_sys_cacheflush':
../arch/csky/mm/syscache.c:17:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   17 |   flush_icache_mm_range(current->mm,
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   18 |     (unsigned long)addr,
      |     ~~~~~~~~~~~~~~~~~~~~
   19 |     (unsigned long)addr + bytes);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../arch/csky/mm/syscache.c:20:2: note: here
   20 |  case DCACHE:
      |  ^~~~

Fixes: 997153b9a7 ("csky: Add flush_icache_mm to defer flush icache all")
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Cc: [email protected]
Cc: Arnd Bergmann <[email protected]>

arch/csky/mm/syscache.c

@@ -17,6 +17,7 @@ SYSCALL_DEFINE3(cacheflush,
 		flush_icache_mm_range(current->mm,
 				(unsigned long)addr,
 				(unsigned long)addr + bytes);
+		fallthrough;
 	case DCACHE:
 		dcache_wb_range((unsigned long)addr,
 				(unsigned long)addr + bytes);