Move bget to libutils replacing dlmalloc

* Moves bget to libutils replacing dlmalloc as kernel memory allocator
* Restores the code formatting of bget.{c,h} to the original state as
parts of the c

Move bget to libutils replacing dlmalloc

* Moves bget to libutils replacing dlmalloc as kernel memory allocator
* Restores the code formatting of bget.{c,h} to the original state as
parts of the current code was unreadable
* Adds malloc_add_pool() to make use of previously unused memory
* Moves call to malloc_init() into platform specific code
* Restores MDBG into working condition
* Adds memalign function to bget.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Tested-by: Jens Wiklander <jens.wiklander@linaro.org> (QEMU virt platform)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (FVP)
Reviewed-by: Etienne Carriere <etienne.carriere@st.com>
Tested-by: Pascal Brand <pascal.brand@linaro.org> (STM platform)

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