drivers/staging: configurable android log buffer sizes [Bhargav Upperla]

Purpose is reduce the buffer size accordingly and observe savings in the total kernel static size, which is useful for memory constrained devices.

Change-Id: I926ab85213c82924ec483327d5aa248372efc604
Signed-off-by: Bhargav Upperla <bhargavuln@codeaurora.org>