configs/qemu_*: bump kernel version to 5.4.88

configs/qemu_*: bump kernel version to 5.4.88

Bump QEMU defconfigs to latest longterm kernel 5.4.88.

Please note that QEMU boards not based on 5.4.y were ignored:
- qemu_csky810_virt_defconfig
- qemu_csky807_virt_defconfig
- qemu_csky610_virt_defconfig
- qemu_csky860_virt_defconfig

Tests were carried out on all QEMU boards using Gitlab [1] (commit
message was slightly different, but the patch is identical)

Additional actions needed were:
- board/qemu/sh4-r2d: Remove one of the two kernel patches [2] provided
  by Alan Modra fixing rodata alignment, carried here by Romain Naour [3]
  to fix an issue preventing kernel from booting with binutils 2.23.
  Patch is present in upstream Linux now.

[1] https://gitlab.com/clumsyape/buildroot/-/pipelines/239483891
[2] https://www.sourceware.org/ml/binutils/2019-12/msg00112.html
[3] https://git.busybox.net/buildroot/commit/?id=a2331c8a61bdd71c47492efc818fb0458a349219

Signed-off-by: Geoffrey Le Gourriérec <geoffrey.legourrierec@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>