Denylist "ota_from_raw_img" module for bp2build

The module introduced in aosp/2722136 depends on `delta_generator`,
which is a module defined in directory that is not bp2build default
allowed, causing bp2build failure. Therefore, denylist the module to
resolve breakage.

Test: TH & abtd
Change-Id: I313239d82d384ec7de8167aa385806ebde02d2c8
Bug: 297269308