This patch enables the ibm_newemac driver for the Walnut board.  It fixes the
device tree for the walnut board to order the MAL interrupts correctly and
adds the local-mac-address property to the EMAC node.  The bootwrapper is also
updated to extract the MAC address from the OpenBIOS offset where it is stored.
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>

The current bootwrapper fails to set the timebase clock to the CPU clock
which causes the time to increment incorrectly.  This fixes it by using the
correct #define for the CPC0_CR1 register.
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>

Add zImage wrapper for walnut board
Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: NDavid Gibson <david@gibson.dropbear.id.au>