patch/sunxi-6.12: drop two Rockchip SPI patches (not applicable to sunxi)

Both patches under patches.megous/ touch drivers/spi/spi-rockchip.c
— Rockchip-only code that's never executed on Allwinner SoCs. They
were carried into the sunxi patchset as residue of megous' multi-
platform series and don't apply to current 6.12 sources (kernel
rockchip_spi_probe() drifted, hunks fail at lines 933/958/937/948/964).

Build failure visible in armbian/os run 25864949324 across both jobs
that build linux-kernel-sunxi-6.12:
  - kernel-sunxi64-legacy (job 76027906041, arm64)
  - kernel-sunxi-legacy   (job 76027905949, armhf)
Both fail identically:
  Failed to apply 2 patches:
    ->patches.megous/spi-rockchip-Fix-runtime-PM-and-other-issues
    ->patches.megous/spi-fixes
  Summary: kernel patching: 458 total; 456 applied; 2 failed_apply

Dropping them is correct in three independent ways:
  - they target a Rockchip SoC driver that doesn't run on sunxi,
  - they don't apply to current sources (would need a rebase that
    would only benefit Rockchip kernels, not us),
  - the rk35xx-* kernel trees don't carry copies, so removing here
    doesn't deprive any downstream of them.

The other 16 'needs_rebase' patches in the same patchset still apply
with offsets, so the kernel still builds; only these two hard-fails.

Author: igorpecovnik