memtest: use phys_addr_t for physical addresses

Since memtest might be used by other architectures pass input parameters
as phys_addr_t instead of long to prevent overflow.

Change-Id: I2e67e46b640298a3823e9a0ceb0455fc74f7ef8b
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: 7f70baeeb9e2d2b2a37a4bd3727d709547c4ae41
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>