lmb: add versions of the lmb API with flags

lmb: add versions of the lmb API with flags

The LMB module is to be used as a backend for allocating and freeing
up memory requested from other modules like EFI. These memory requests
are different from the typical LMB reservations in that memory
required by the EFI module cannot be overwritten, or re-requested. Add
versions of the LMB API functions with flags for allocating and
freeing up memory. The caller can then use these API's for specifying
the type of memory that is required. For now, these functions will be
used by the EFI memory module.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>