misc: updated shabang for python script

The default python on MacOS doesn’t have an alias to python2.
The official python version supported in gem5 is Python2.7.

This patch updates the shabang according to the version required in gem5.

Change-Id: I9533c0f7858b5b3cab0ef101be1ee5cd718105b0
Reviewed-on: https://gem5-review.googlesource.com/c/15375
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

util,arch-arm: Update gen_arm_fs_files.py to use new kernel repos

Now it is using the kernels on https://gem5.googlesource.com/arm

Change-Id: I765f2b8ee48cfd7175e5b17a65db3bf612570c68
Signed-off-by: Pau Cabre <pau.cabre@metempsy.com>
Reviewed-on: https://gem5-review.googlesource.com/9481
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

util,arch-arm: Added python script to generate ARM FS binaries

This python script builds the bootloaders, kernels and DTBs for the
VExpress_GEM5_V1 (aarch32/aarch64), VExpress_EMM and VExpress_EMM64
platforms (it checkouts some linux kernel repositories when needed).

This is the result of this e-mail thread in gem5-dev mailing list:
http://www.mail-archive.com/gem5-dev@gem5.org/msg22406.html

Change-Id: Ida8f9b974f7188f48be8f84f14828a1973d6d256
Signed-off-by: Pau Cabre <pau.cabre@metempsy.com>
Reviewed-on: https://gem5-review.googlesource.com/3945
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>