configs/qemu_sh4{, eb}-r2d: remove kernel patch "restore the old sh-sci driver behaviour"

configs/qemu_sh4{, eb}-r2d: remove kernel patch "restore the old sh-sci driver behaviour"

This reverts commit f7a887c3682282a281206bca61724a750c326b3d and
23aee3eac497f15f901ddf99ab3aa81af747f7e5 since the kernel patch
is not needed as soon as qemu >= 3.1.0 is used with a kernel >=
4.11-rc1.

The qemu emulation of sh-sci driver was fixed by adding basic
timeout handling for 9600 bps [1].

[1] https://git.qemu.org/?p=qemu.git;a=commit;h=71bb4ce1b5592cdc03abc48cdf4ecb15b2db81a0

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>