drm/rockchip: vop2: include rockchip_drm_drv.h

Move rockchip_drm_drv.h in rockchip_drm_vop2.h to fix the follow
sparse warning:

ARCH=arm64 LLVM=1 make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
mrproper defconfig all  -j12

drivers/gpu/drm/rockchip/rockchip_vop2_reg.c:502:24: sparse:
warning: symbol 'vop2_platform_driver' was not declared. Should it
be static?

It is also beneficial for the upcoming support for rk3576.

Fixes: 604be855 ("drm/rockchip: Add VOP2 driver")
Signed-off-by: Min-Hua Chen <minhuadotchen@gmail.com>
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Min-Hua Chen <minhuadotchen@gmail.com>
Tested-by: Detlev Casanova <detlev.casanova@collabora.com>
Tested-by: Michael Riesch <michael.riesch@wolfvision.net> # on RK3568
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20241214081719.3330518-8-andyshrk@163.com