powerpc: Fix prom_init on 32-bit OF machines

Commit e7943fbbfdb6eef03c003b374de1f802cc14f02a broke ppc32 using
Open Firmware client interface due to using the wrong relocation
macro when accessing the variable "linux_banner".

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
1 file changed