[RCAR] Remove useless recipes

On the branch kirkstone-dev_3.5_M3_v5.9.0 of meta-renesas some recipes
are now up to date and don't need patches anymore.

Bug-AGL: SPEC-4343

Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>
[Restored arm-trusted-firmware patch as it is still needed for any
  potential Xen use.]
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ib0eac9fe65f28645ec9aab5cf987508457d92ea9
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27424
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>