mips: octeon: cpu.c: Move bootmem init to arch_early_init_r()

Call octeon_bootmem_init() earlier in the boot process, so that this
bootmemory infrastructure is already initialized when e.g. the
networking support gets probed.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 06cae68..9b62764 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -101,6 +101,7 @@
 
 config ARCH_OCTEON
 	bool "Support Marvell Octeon CN7xxx platforms"
+	select ARCH_EARLY_INIT_R
 	select CPU_CAVIUM_OCTEON
 	select DISPLAY_CPUINFO
 	select DMA_ADDR_T_64BIT