mpc85xx: allow mapping of cpu1 spin-table page

The no-map property was incorrectly added, which kept the system-memory
available on the WS-AP3825 limited to 190MB. We are allowed to map the
page containing the CPU1 spin-table, we are just not allowed to write to
it.

Fixes: 57d7382cb159 ("mpc85xx: increase available RAM on Extreme Networks WS-AP3825i")

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit d9271aa5b7ddcef20ebe64d1d80c8ddcd6cd7fb7)

target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts

@@ -315,7 +315,6 @@
 		cpu1-bootpage@e000000 {
 			/* Reserve upper 1 MB for second-core-bootpage */
 			reg = <0x0 0xff00000 0x0 0x100000>;
-			no-map;
 		};
 	};