iopsys-econet: Add more RAM for kernel

Compressed kernel image must be loaded higher to prevent overlapping
by uncompressed kernel.

loadaddr: 0x86800000
Load Address: 0x80088000

Gives ~108Mb for uncompressed kernel. It is ~84Mb now.

Signed-off-by: Bartlomiej Grzeskowiak <bartlomiej.grzeskowiak@iopsys.eu>