lmb: Remove lmb_add_region()

lmb: Remove lmb_add_region()

There's no point defining a function that's called only once just to
avoid passing the flags. Remove the wrapper and just call
lmb_add_region_flags().

Acked-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Tested-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>