fix print_size printing fractional gigabyte numbers on 32-bit platforms

In print_size(), the math that calculates the fractional remainder of a number
used the same integer size as a physical address.  However, the "10 *" factor
of the algorithm means that a large number (e.g. 1.5GB) can overflow the
integer if we're running on a 32-bit system.  Therefore, we need to
disassociate this function from the size of a physical address.

Signed-off-by: Timur Tabi <timur@freescale.com>

lib/display_options.c

@@ -45,8 +45,8 @@ int display_options (void)
  */
 void print_size (phys_size_t size, const char *s)
 {
-	ulong m = 0, n;
-	phys_size_t d = 1 << 30;		/* 1 GB */
+	unsigned long m = 0, n;
+	unsigned long long d = 1 << 30; 	/* 1 GB */
 	char  c = 'G';
 
 	if (size < d) {			/* try MB */