media: atomisp: unify the version for isp2401 a0 and b0 versions

Based on Yocto Aero's repository, the file name for the isp2401
is the same for the B0 release.

So, unify it at the driver.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>