common: kconfig: Mark AVB_VERIFY as dependent on PARTITION_UUIDS

common: kconfig: Mark AVB_VERIFY as dependent on PARTITION_UUIDS

Avoid below compiler [1] errors, reproduced with configuration [2]:

common/avb_verify.c: In function ‘get_unique_guid_for_partition’:
common/avb_verify.c:692:31: error: ‘disk_partition_t {aka struct disk_partition}’ has no member named ‘uuid’
  uuid_size = sizeof(part->info.uuid);
                               ^
common/avb_verify.c:696:29: error: ‘disk_partition_t {aka struct disk_partition}’ has no member named ‘uuid’
  memcpy(guid_buf, part->info.uuid, uuid_size);
                             ^
  LD      drivers/built-in.o
make[2]: *** [scripts/Makefile.build:278: common/avb_verify.o] Error 1

[1] aarch64-linux-gnu-gcc (Linaro GCC 7.2-2017.11)
[2] r8a7795_ulcb_defconfig, plus:
    CONFIG_AVB_VERIFY=y
    CONFIG_PARTITION_UUIDS=y
    CONFIG_UDP_FUNCTION_FASTBOOT=y
    CONFIG_LIBAVB=y

Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@linaro.org>