Revert "memsize: Fix for bug in memory sizing code"
After further investigation this change is not correct and results in
get_ram_size returning incorrectly large values. Reported first by
Gerlando Falauto.
This reverts commit b8496cced856ff411f1eb2e4eff20f5abe7080b0.
Signed-off-by: Tom Rini <trini@ti.com>