treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX

With PHYS_ADDR_MAX there is now a type safe variant for all bits set.
Make use of it.

Patch created using a semantic patch as follows:

// <smpl>
@@
typedef phys_addr_t;
@@
-(phys_addr_t)ULLONG_MAX
+PHYS_ADDR_MAX
// </smpl>

Link: http://lkml.kernel.org/r/20180419214204.19322-1-stefan@agner.ch
Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>	[arm64]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mips/kernel/setup.c

@@ -93,7 +93,7 @@ void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
 	 * If the region reaches the top of the physical address space, adjust
 	 * the size slightly so that (start + size) doesn't overflow
 	 */
-	if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
+	if (start + size - 1 == PHYS_ADDR_MAX)
 		--size;
 
 	/* Sanity check */
@@ -376,7 +376,7 @@ static void __init bootmem_init(void)
 	unsigned long reserved_end;
 	unsigned long mapstart = ~0UL;
 	unsigned long bootmap_size;
-	phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
+	phys_addr_t ramstart = PHYS_ADDR_MAX;
 	bool bootmap_valid = false;
 	int i;