lmb: Remove lmb_alloc_flags()

lmb: Remove lmb_alloc_flags()

lmb_alloc_flags() & lmb_alloc_base_flags() are just a wrappers for
_lmb_alloc_base(). Since the only difference is the max address of the
allowed allocation which _lmb_alloc_base() already supports with the
LMB_ALLOC_ANYWHERE flag, remove one of them.

Keep the lmb_alloc_base_flags() which also prints an error on failures
and adjust efi_allocate_pages() to only use one of them.

While at it clean up the duplicate function description from the header
file.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>