Remove unnecessary break statements

Fix these warnings from cppcheck:

hw/display/cirrus_vga.c:2603:
hw/sd/sd.c:348:
hw/timer/exynos4210_mct.c:1033:
target-arm/translate.c:9886:
target-s390x/mem_helper.c:518:
target-unicore32/translate.c:1936:
 style: Consecutive return, break, continue, goto or throw statements are unnecessary.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

target-unicore32/translate.c

@@ -1933,7 +1933,6 @@ static inline void gen_intermediate_code_internal(CPUUniCore32State *env,
                        invalidate this TB.  */
                     dc->pc += 2; /* FIXME */
                     goto done_generating;
-                    break;
                 }
             }
         }