The term "exclusive for Android" in this context is a marketing fantasy. A BIOS file, if it existed, is hardware-specific code written in the PS3’s native instruction set (PowerPC-based). It would not require modification to run on ARM-based Android devices because an emulator already translates CPU instructions. An "exclusive" BIOS would imply a firmware rewritten specifically for Android's ARM architecture—but that would be a proprietary recreation, not a BIOS dump. No development team has announced or is plausibly working on such a project, as it would offer no advantage over standard HLE (High-Level Emulation) approaches used by RPCS3.
Several PS3 emulators are available for Android, each with its strengths and weaknesses. Some of the notable ones include: ps3 emulator bios for android exclusive
A BIOS (Basic Input/Output System) is the system software required by an emulator to mimic the console's hardware environment. For PlayStation 3 emulation: The term "exclusive for Android" in this context