soc/intel/quark: Fix legacy GPIO reads

Add missing break to LEG_GPIO_REGS case to return the correct value for
legacy GPIO reads.  Fixes coverity issue CID 1357460.

Found by Coverity, Fixes:
* CID 1357460 (#1 of 1): Unused value (UNUSED_VALUE)
  returned_value: Assigning value from reg_legacy_gpio_read(step->reg)
  to value here, but that stored value is overwritten before it can be
  used.

  value_overwrite: Overwriting previous write to value with value from
  reg_pcie_afe_read(step->reg).

TEST=Build and run on Galileo Gen2.

Change-Id: I6c52e8801a32f510ac94276fe0c097850cbfde57
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15732
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions