Use PHYS_SDRAM_1_SIZE instead of magic value

U-Boot likes the defines PHYS_SDRAM_n_* and we should agree.

Patch applies cleanly to sunxi-current.

Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>
Randdom tiny fixes (resend based on sunxi-current)

I ran into little stuff that wasn't consistend and required fixing.
It's really just nitpicking on little things. It should have gone into
the previous cleanup patch; but i overlooked these 2 files.

Signed-off-by: Oliver Schinagl <oliver@schinagl.nl>