kernel: 5.10: drop broken-flash-reset patch

Flash accessing instruction templates are determined during probe since
v5.6 for spimem-dirmap support in spi-nor driver in upstream commit:
df5c21002cf4 ("mtd: spi-nor: use spi-mem dirmap API")
As a result, changing bus_width on the fly doesn't work anymore and this
patch will cause executing spi-mem ops with 3-byte address on 16-32M
flash area.
We can't easily revert that behavioral change upstream so drop the patch
to prevent u-boot and eeprom from being erased.

Fixes: b10d6044("kernel: add linux 5.10 support")
Reported-by: Frank Di Matteo <dimatto@foxmail.com>
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>