Update the RCar M3 inc file to add agl-egvirt feature

Update the RCar M3 inc file to add agl-egvirt feature

"agl-egvirt" added to the Renesas RCar M3's MACHINE_FEATURES in order
to enable AGL virtualization extensions.

Depends on change: 10547
Bug-AGL: SPEC-718

Change-Id: I708a7fb958abd76cb1af095842b78fe2f6a64dc9
Signed-off-by: Michele Paolino <m.paolino@virtualopensystems.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10597
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>