ARM: sa11x0: assabet: fix build warning

Since a32618d2 (ARM: pgtable: switch to use pgtable-nopud.h), assabet
warns as follows:

arch/arm/mach-sa1100/assabet.c: In function 'map_sa1100_gpio_regs':
arch/arm/mach-sa1100/assabet.c:264: warning: passing argument 1 of 'pmd_offset' from incompatible pointer type

Fix this by adding the necessary pud_offset() macro.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/assabet.c

@@ -268,7 +268,7 @@ static void __init map_sa1100_gpio_regs( void )
 	int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 	pmd_t *pmd;
 
-	pmd = pmd_offset(pgd_offset_k(virt), virt);
+	pmd = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
 	*pmd = __pmd(phys | prot);
 	flush_pmd_entry(pmd);
 }