binman: Refactor binman_entry_find() to allow other nodes

At present we can only read from a top-level binman node entry. Refactor
this function to produce a second local function which supports reading
from any node.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
1 file changed