ARM: uniphier: fix ROM boot mode for PH1-sLD3

Commit 4b50369fb5 ("ARM: uniphier: create early page table at
run-time") broke the ROM boot mode for PH1-sLD3 SoC, because the
run-time page table creation requires the outer cache register
access but the page table in the sLD3 Boot ROM does not straight-map
virtual/physical addresses.

The idea here is to check the current page table to determine if
it is a straight map table.  If not, adjust the outer cache register
base.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/arm32/lowlevel_init.S

@@ -99,6 +99,11 @@ ENDPROC(enable_mmu)
 
 ENTRY(setup_init_ram)
 	ldr	r1, = SSCO_BASE
+	mrc	p15, 0, r0, c2, c0, 0	@ TTBR0
+	ldr	r0, [r0, #0x400]	@ entry for virtual address 0x100*****
+	bfc	r0, #0, #20
+	cmp	r0, #0x50000000		@ is sLD3 page table?
+	biceq	r1, r1, #0xc0000000	@ sLD3 ROM maps 0x5******* to 0x1*******
 
 	/* Touch to zero for the boot way */
 0:	ldr	r0, = 0x00408006	@ touch to zero with address range