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>
Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: lower android log buffer sizes

Signed-off-by: Dan Trifan <jimsth@gmail.com>
logger: Add sys fs kernel interface to configure Android logger

- now logging can be switched on and off via /sys/kernel/logger_mode/logger_mode interface
- default is 1 (on)

Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: switch back to dynfsync

Signed-off-by: Dan Trifan <jimsth@gmail.com>