drivers/staging: Configurable android log buffer sizes

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>
[zwliew: Configure for kernel console logcat too]
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>

Conflicts:
	drivers/staging/android/logger.c