misc: fastrpc: define names for protection domain ids

Define SENSORS_PD for the next patch, to void using magic values for these.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20200908131013.19630-3-jonathan@marek.ca


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>