csky: bugfix the bit0 of entrylo0 and entrylo1 must be the same.

In csky processor, hardware tlb entry need the same global bit0 for
work. So csky-linux must prepare the same G-bit in every pte_entry.

Test case in spi-ubifs:
 dd if=/dev/zero of=/mnt/sdcard/hello1.txt bs=10M count=5 &

Change-Id: Ib8eda99b7147c66a2ddb6d7e7b2d3283b61a0821
Signed-off-by: Guo Ren <ren_guo@c-sky.com>