panfrost: Add GPU IDs for G52 1-Core-2EE (RK3568/RK3566)

panfrost: Add GPU IDs for G52 1-Core-2EE (RK3568/RK3566)

Rockchip SoCs RK3566 and RK3568 have a Gondul with
one shader core and two execution engines, with product ID 0x7402.

Quoting the datasheet:

Mali-G52 1-Core-2EE
* Support 1600Mpix/s fill rate when 800MHz clock frequency
* Support 38.4GLOPs when 800MHz clock frequency

To distinguish it from other variants of G52, we agreed
to call this "G52L", L is for Little.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10771>