arm64: dts: arm: Remove the dangling vexpress-v2m-rs1.dtsi symlink

Commit 724ba67 ("ARM: dts: Move .dts files to vendor sub-directories")
moved all arm vendor specific DTS into the sub-directory and updated
vexpress-v2f-1xv7-ca53x2.dts accordingly to include vexpress-v2m-rs1.dtsi
from the right path. However the symlink was left dangling which is harmless
and causes no issue for the build.

Just remove the dangling symlink now that it is noticed and reported.

Fixes: 724ba67 ("ARM: dts: Move .dts files to vendor sub-directories")
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Reported-by: Avram Lubkin <avram@rockhopper.net>
Reported-by: Darren Kenny <darren.kenny@oracle.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://lore.kernel.org/r/20230706085534.300828-1-sudeep.holla@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Author: sudeep-holla