msm: Rename readll/writell to readq/writeq

Upstream kernel uses readq/writeq for 64-bit IO operations.  Rename
macros in io.h to match and convert various users of readl/writel to
readq/writeq.

Change-Id: I7600391006f32ab4f87d42a49889cc2641ead67b
Signed-off-by: Kumar Gala <galak@codeaurora.org>