staging: octeon: Use "(uintptr_t)" to cast from pointer to int

staging: octeon: Use "(uintptr_t)" to cast from pointer to int

On 32-bit:

    In file included from drivers/staging/octeon/octeon-ethernet.h:41,
		     from drivers/staging/octeon/ethernet-tx.c:25:
    drivers/staging/octeon/octeon-stubs.h: In function ‘cvmx_phys_to_ptr’:
    drivers/staging/octeon/octeon-stubs.h:1205:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      return (void *)(physical_address);
	     ^
    drivers/staging/octeon/ethernet-tx.c: In function ‘cvm_oct_xmit’:
    drivers/staging/octeon/ethernet-tx.c:264:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
       hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
					 ^
    drivers/staging/octeon/octeon-stubs.h:2:30: note: in definition of macro ‘XKPHYS_TO_PHYS’
     #define XKPHYS_TO_PHYS(p)   (p)
				  ^
    drivers/staging/octeon/ethernet-tx.c:268:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
       hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)skb->data);
					 ^
    drivers/staging/octeon/octeon-stubs.h:2:30: note: in definition of macro ‘XKPHYS_TO_PHYS’
     #define XKPHYS_TO_PHYS(p)   (p)
				  ^
    drivers/staging/octeon/ethernet-tx.c:276:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
	 XKPHYS_TO_PHYS((u64)skb_frag_address(fs));
			^
    drivers/staging/octeon/octeon-stubs.h:2:30: note: in definition of macro ‘XKPHYS_TO_PHYS’
     #define XKPHYS_TO_PHYS(p)   (p)
				  ^
    drivers/staging/octeon/ethernet-tx.c:280:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
       hw_buffer.s.addr = XKPHYS_TO_PHYS((u64)CVM_OCT_SKB_CB(skb));
					 ^
    drivers/staging/octeon/octeon-stubs.h:2:30: note: in definition of macro ‘XKPHYS_TO_PHYS’
     #define XKPHYS_TO_PHYS(p)   (p)
				  ^

Fix this by replacing casts to "u64" by casts to "uintptr_t", which is
either 32-bit or 64-bit, and adding an intermediate cast to "uintptr_t"
where needed.

Exposed by commit 171a9bae68c72f2d ("staging/octeon: Allow test build on
!MIPS").

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20190919095022.29099-1-geert@linux-m68k.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>