disk: honor CONFIG_SYS_64BIT_LBA

Without the patch for qemu-x86_defconfig:

* sizeof(lbaint_t) = 4 in dev_read()
* sizeof(lbaint_t) = 8 in blkcache_read()

CONFIG_SYS_64BIT_LBA is defined in common.h via
include/configs/x86-common.h:22.

We have to include common.h before including blk.h.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>