ARM: UniPhier: extend register area of init page table for PH1-sLD3

0x20000000-0x2fffffff: assigned to ARM mpcore (sLD3 only)
0xf0000000-0xffffffff: assigned to Denali NAND controller (sLD3 only)

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>