gen_devtree: Add reserved-memory node

Add the reserved-memory node to define the memory region
the PNOR maps into if the host SPI flash LPC mailbox
is enabled.

Change-Id: Ic7c0b42fdd6d03cb7816dbdab6da8e7fbcc5a725
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
1 file changed