[MTD] physmap: Add support for 64 bit resources

This patch adds support for 64 bit resources enabled via the
CONFIG_RESOURCES_64BIT option. Now a 64 bit can be passed to the
physmap driver.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>