package/grpc: bump to version 1.48.0

- rework host-grpc-only-cpp-plugin.patch to match changed CMakeLists.txt
- reintroduce patch to fix cross_compile with host grpc_cpp_plugin [1]
- add patch to disable unconditionally downloading repos of 3rd party APIs not
  used in build [2]

[1] https://github.com/grpc/grpc/pull/30378
[2] https://github.com/grpc/grpc/issues/30385



Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>