[U-Boot] Regarding revert of "Simplify RAM size detection" patch

[Sam Protsenko]

Hi guys,

I see that "Simplify RAM size detection" patch is reverted now. It was
breaking boot on DRA7XX EVM as well. But I think I found the actual
bug in that patch. This line (from patch):

-       for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
+       for (cnt = (maxsize / sizeof(long)) >> 1; cnt >= 0; cnt >>= 1) {

is changing loop condition to "cnt >= 0". And once cnt is 0, loop
continue iterating, turning into forever loop. To fix this one can add
"break" line here:

        for (cnt = (maxsize / sizeof(long)) >> 1; cnt >= 0; cnt >>= 1) {
                addr = base + cnt;      /* pointer arith! */
                sync();
                save[i] = *addr;
                sync();
                if (cnt) {
                        i++;
                        *addr = ~cnt;
                } else {
                        *addr = 0;
+                       break;
                }

So if someone is going to rework it and push again -- this note can be helpful.