Fixed ERT firmware packaging issue

[fquinner]

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When proving the user's own sched*.bin binaries, the ERTFW_FILES variable contains the required ERT firmware files but it is only used in one target firmware location in the target install directory structure. This fix ensure it is also added to the directory expected by the xrt base packages.

Problem solved by the commit

RPM package created does not contain the sched bin files in /opt/xilinx/xrt/share/fw. This causes the xrt base RPM to fail to build the required XSA shells so they in turn silently fail.

Bug / issue (if any) fixed, which PR introduced the bug, how it was discovered

Discovered while trying to set up a Xilinx card with XRT for the first time.

[gbuildx]

fquinner - is not a collaborator Can XRT admins please validate PR

[gbuildx]

Can one of the admins verify this patch?

[gbuildx]

fquinner - is not a collaborator Can XRT admins please validate PR

[chvamshi-xilinx]

\build

[gbuildx]

fquinner - is not a collaborator Can XRT admins please validate PR