build:add sbin and bin to path.

normal users don't have sbin in their path where sfdisk is
installed.

Change-Id: I7ee3412ca0f6fb208310aa7a0ee8cd88c0f3f80c
build:make sdimage more silent.

Change-Id: I9bba37c93c27c599ec914d1f069ca21e6cbfe111
build:copy uEnv and cmdline.txt onto OBJ
build:arm disable I and D cache before loading the kernel.
build:arm enable verbose mode by default.
arm:make no assumptions about TRE and AFE

The bootloader can leave the system control register
in at state that doesn't match our setup. make no assumptions
and configure TRE and AFE.
arm:vm header cleanup.
arm:vm caching fix.

Improve reliability by using write trough cache.
virtio_blk: always start if found

Change-Id: Iec70c67e1b675297b5ffb800a9fb263feffa9271
at_wini: enable busmastering in pci if necessary
Merge branch 'master' of git://git.minix3.org/minix