Introduce a driver to provide calls into secure monitor mode.
In the Amlogic SoCs these calls are used for multiple reasons: access to
NVMEM, set USB boot, enable JTAG, etc...
Acked-by: Mark Rutland
Signed-off-by: Carlo Caione
[khilman: add in SZ_4K cleanup]
Signed-off-by: Kevin Hilman