memblock: Add memblock_overlaps_memory()

Add a new function, memblock_overlaps_memory(), to check if a
region overlaps with a memory bank. This will be used by
peripheral loader code to detect when kernel memory would be
overwritten.

Change-Id: I851f8f416a0f36e85c0e19536b5209f7d4bd431c
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>

memblock: Fix memblock_overlaps_memory()

This function always returns true, because it calls
memblock_overlaps_region() which returns a bool now. Change the
signature to bool and pass it on up instead.

Change-Id: I4b6403b823d20552a28006e35083d8056346dc51
Cc: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>