wlbt: Implement mxlogger module

wlbt: Implement mxlogger module

Implement mxlogger module, responsible of:
- Defining and providing logging buffers in Shared
DRAM
- Providing a communication channel from/to FW to
send receive low level logging commands (START,
STOP, SWITCH, FW_TRIGGER...)
- Creating an interface to register/unregister
local or global observers
- Implementing the control mechanism to instruct the
FW to store logs in Shared DRAM or stream logs to
Host

Keep logs streamed to host by default

Change-Id: Ia831573630a07c63fb3420aa28bcddd932296548
SCSC-Bug-Id: SSB-41855
Signed-off-by: Cristian Marussi <c.marussi@samsung.com>
Signed-off-by: Albert Cano <a.canocamps@samsung.com>