[ARM] 2997/1: Replace map_desc.physical with map_desc.pfn: EBSA110

Patch from Deepak Saxena

EBSA110 map_desc.pfn conversion

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>