util: Change gen_arm_fs_files.py to allow selective compilation
util: Change gen_arm_fs_files.py to allow selective compilation

With the -b/--fs-binaries option it is possible to specify a list
of fs binaries to be fetched/compiled.

Change-Id: I12a642f65b74e8606c82cdddcbc3a8172bad2381
Signed-off-by: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32554
Reviewed-by: Richard Cooper <5451b9f082a6f419264dc2e8898d5200257ca9ce@arm.com>
Maintainer: Gabe Black <5c8aa1266c03186393d9e7b3b4e3b14239af8201@google.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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